diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 3055b6b..2733dbf 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,3 +1,13 @@
+Quisk Version 4.2.45  October 2025
+==================================
+The new FreeDV including RADE mode is now a built-in mode of Quisk. Just press "FDV" to talk FreeDV.
+In brief, install FreeDV-GUI from the web site. Then configure the usual Quisk digital input and
+output that you use for digital modes. In FreeDV-GUI use the digital input and output. For the
+speakers and microphone use the same ones as Quisk. Don't forget to configure your call sign in
+FreeDV so it works with FreeDV Reporter. For detailed instructions see http://james.ahlstrom.name/rade.html.
+
+The Quisk digital output device is now always active; a DGT mode is not required.
+
 Quisk Version 4.2.44  September 2025
 ====================================
 Quisk now has Pure Signal for the Hermes Lite2. This is baseband predistortion to reduce IMD products.
diff --git a/__init__.py b/__init__.py
index e9a2a64..24b9b9b 100644
--- a/__init__.py
+++ b/__init__.py
@@ -1,2 +1,2 @@
-#Quisk version 4.2.44
+#Quisk version 4.2.45
 from .quisk import main
diff --git a/ac2yd/control_common.py b/ac2yd/control_common.py
index 24d8bdc..9e492d0 100644
--- a/ac2yd/control_common.py
+++ b/ac2yd/control_common.py
@@ -395,7 +395,7 @@ class ControlCommon(BaseHardware):	# This is the Hardware class for the control
     for idName in ("Mute", "NR2", "AGC", "Sqlch", "NB 1", "Notch", "Test 1", "Spot", "FDX", "PTT", "VOX"):
       self.RemoteCtlSend("%s;%d\n" % (idName, app.idName2Button[idName].GetIndex()))
     # Menus
-    for menu in (app.NB_menu, app.split_menu, app.freedv_menu, app.smeter_menu):
+    for menu in (app.NB_menu, app.split_menu, app.smeter_menu):
       if menu:
         for nid in menu.id2data:
           menu_item = menu.FindItemById(nid)
diff --git a/docs.html b/docs.html
index 61c4a67..50a5657 100644
--- a/docs.html
+++ b/docs.html
@@ -200,7 +200,8 @@ If you have Python 3 installed on your computer, just continue to use that versi
 <b>On Windows Quisk requires Python 3.8, 3.9, 3.10, 3.11, 3.12 or 3.13.</b>
 If you want to install a more recent version of Python, uninstall the old version first.
 Running multiple versions of Python is possible but can be confusing and is not necessary.
-A Quisk installation is needed for each version of Python you have.
+<b>A Quisk installation is needed for each version of Python you have. If you upgrade to a newer Python
+you must re-install Quisk. But your Quisk settings will be preserved.</b>
 </p>
 <br>
 <h3 id="g0.2.2">Windows Initial Installation</h3>
diff --git a/freedv.c b/freedv.c
index bf5a72e..bf04050 100644
--- a/freedv.c
+++ b/freedv.c
@@ -1,681 +1 @@
-#include <Python.h>
-#include <stdlib.h>
-#include <math.h>
-#include <complex.h>	// Use native C99 complex type for fftw3
-#include <sys/types.h>
-
-#include "quisk.h"
-#include "freedv.h"
-#include <stdint.h>
-
-int DEBUG;
-
-#define MAX_RECEIVERS	2
-
-typedef struct {	// from comp.h
-  float real;
-  float imag;
-} COMP;
-
-struct freedv;		// from freedv_api.h
-typedef void (*freedv_callback_rx)(void *, char);
-typedef char (*freedv_callback_tx)(void *);
-/* Protocol bits are packed MSB-first */
-/* Called when a frame containing protocol data is decoded */
-typedef void (*freedv_callback_protorx)(void *, char *);
-/* Called when a frame containing protocol data is to be sent */
-typedef void (*freedv_callback_prototx)(void *, char *);
-/* Data packet callbacks */
-/* Called when a packet has been received */
-typedef void (*freedv_callback_datarx)(void *, unsigned char *packet, size_t size);
-/* Called when a new packet can be send */
-typedef void (*freedv_callback_datatx)(void *, unsigned char *packet, size_t *size);
-
-/* advanced freedv open options required by some modes */
-struct freedv_advanced {
-  int interleave_frames;  // now unused but remains to prevent breaking API for
-                          // legacy apps
-
-  // parameters for FREEDV_MODE_FSK_LDPC
-  int M;             // 2 or 4 FSK
-  int Rs;            // Symbol rate Hz
-  int Fs;            // Sample rate Hz
-  int first_tone;    // Freq of first tone Hz
-  int tone_spacing;  // Spacing between tones Hz
-  char *codename;    // LDPC codename, from codes listed in ldpc_codes.c
-};
-
-#ifdef MS_WINDOWS
-#include <windows.h>
-HMODULE hLib;
-#define GET_HANDLE1			hLib = LoadLibrary("libcodec2.dll")
-#define GET_HANDLE2			hLib = LoadLibrary(".\\freedvpkg\\libcodec2.dll")
-#define GET_HANDLE3			hLib = LoadLibrary(".\\freedvpkg\\libcodec2_32.dll")
-#define GET_HANDLE4			hLib = LoadLibrary(".\\freedvpkg\\libcodec2_64.dll")
-#define GET_ADDR(name)		(void *)GetProcAddress(hLib, name)
-#define CLOSE_LIB			FreeLibrary(hLib)
-#else
-#include <dlfcn.h>
-void * hLib;
-#define GET_HANDLE1			hLib = dlopen("libcodec2.so", RTLD_LAZY)
-#define GET_HANDLE2			hLib = dlopen("./freedvpkg/libcodec2.so", RTLD_LAZY)
-#define GET_HANDLE3			hLib = dlopen("./freedvpkg/libcodec2_32.so", RTLD_LAZY)
-#define GET_HANDLE4			hLib = dlopen("./freedvpkg/libcodec2_64.so", RTLD_LAZY)
-#define GET_ADDR(name)		dlsym(hLib,  name)
-#define CLOSE_LIB			dlclose(hLib)
-#endif
-
-static int requested_mode = -1;			// requested mode
-int freedv_current_mode = -1;			// the current running mode
-static int quisk_freedv_squelch;
-static int interleave_frames = 1;
-static int freedv_version = -1;
-static int quisk_set_tx_bpf = 1;
-static int handle_index = -1;
-// need access to these here and in quisk.c
-int n_speech_sample_rate = 8000;
-int n_modem_sample_rate = 8000;
-int n_max_modem_samples = 1000;
-
-#define SPEECH_BUF_SIZE		12000		// speech buffer size increased from 3000
-#define MAX_MODEM_SAMPLES	8192		// maximum of n_max_modem_samples for any mode
-#define MAX_SPEECH_SAMPLES	8192		// maximum of n_speech_samples for any mode
-static struct _rx_channel{
-	struct freedv * hFreedv;
-	short * demod_in;
-	int rxdata_index;
-	short speech_out[SPEECH_BUF_SIZE];		// output buffer
-	int speech_available;					// number of samples in output buffer
-	int playing;							// are we currently returning speech samples?
-} rx_channel[MAX_RECEIVERS] = { 0 };		// safe initialisation to 0
-
-// freedv_version is the library version number, or
-//   -1		no library was found
-//   -2		a library was found, but freedv_get_version is missing
-
-// FreeDV API functions:
-// open, close
-struct freedv * (*freedv_open)(int mode);
-struct freedv * (*freedv_open_advanced)(int mode, struct freedv_advanced *adv);
-void (*freedv_close)(struct freedv *freedv);
-// Transmit
-void (*freedv_tx)(struct freedv *freedv, short *, short *);
-void (*freedv_comptx)(struct freedv *freedv, COMP *, short *);
-// Receive
-int (*freedv_nin)(struct freedv *freedv);
-int (*freedv_rx)(struct freedv *freedv, short *, short demod_in[]);
-int (*freedv_floatrx)(struct freedv *freedv, short *, float demod_in[]);
-int (*freedv_comprx)(struct freedv *freedv, short *, COMP demod_in[]);
-// Set parameters
-void (*freedv_set_callback_txt)		(struct freedv *freedv, freedv_callback_rx rx, freedv_callback_tx tx, void *callback_state);
-void (*freedv_set_test_frames)			(struct freedv *freedv, int test_frames);
-void (*freedv_set_smooth_symbols)		(struct freedv *freedv, int smooth_symbols);
-void (*freedv_set_squelch_en)			(struct freedv *freedv, int squelch_en);
-void (*freedv_set_snr_squelch_thresh)	(struct freedv *freedv, float snr_squelch_thresh);
-void (*freedv_set_tx_bpf)		(struct freedv *freedv, int val);
-// Get parameters
-int (*freedv_get_version)(void);
-void (*freedv_get_modem_stats)(struct freedv *freedv, int *sync, float *snr_est);
-int (*freedv_get_test_frames)			(struct freedv *freedv);
-int (*freedv_get_n_speech_samples)		(struct freedv *freedv);
-int (*freedv_get_n_max_modem_samples)	(struct freedv *freedv);
-int (*freedv_get_n_nom_modem_samples)	(struct freedv *freedv);
-int (*freedv_get_total_bits)			(struct freedv *freedv);
-int (*freedv_get_total_bit_errors)		(struct freedv *freedv);
-int (*freedv_get_modem_sample_rate)		(struct freedv *freedv);
-int (*freedv_get_speech_sample_rate)	(struct freedv *freedv);
-//
-int (*freedv_get_sync)					(struct freedv *freedv);
-void (*freedv_set_callback_protocol)	(struct freedv *freedv, freedv_callback_protorx rx, freedv_callback_prototx tx, void *callback_state);
-void (*freedv_set_callback_data)	(struct freedv *freedv, freedv_callback_datarx datarx, freedv_callback_datatx datatx, void *callback_state);
-
-//
-// checkAvxSupport
-//
-// This function was copied from freedv, file fdmdv2_main.cpp and tweaked for use here
-//
-// Tests the underlying platform for AVX support.  2020 needs AVX support to run
-// in real-time, and old processors do not offer AVX support
-//
-
-#if defined(__x86_64__) || defined(_M_X64) || defined(__i386) || defined(_M_IX86)
-#include <cpuid.h>
-static int checkAvxSupport(void)
-{
-
-    int isAvxPresent = 0;
-    uint32_t eax, ebx, ecx, edx;
-    eax = ebx = ecx = edx = 0;
-    __cpuid(1, eax, ebx, ecx, edx);
-
-    if (ecx & (1<<27) && ecx & (1<<28)) {
-        // CPU supports XSAVE and AVX
-        uint32_t xcr0, xcr0_high;
-        asm("xgetbv" : "=a" (xcr0), "=d" (xcr0_high) : "c" (0));
-        isAvxPresent = (xcr0 & 6) == 6;    // AVX state saving enabled?
-    }
-	return isAvxPresent;
-}
-#else
-static int checkAvxSupport(void)
-{
-    return 0;
-}
-#endif
-
-/* Called when a new packet can be sent */
-void my_datatx(void *callback_state, unsigned char *packet, size_t *size) {
-	*size = 0;
-}
-
-static void GetAddrs(void)
-{
-	handle_index = 1;
-	GET_HANDLE1;
-	if ( ! hLib) {
-		handle_index = 2;
-		GET_HANDLE2;
-		if ( ! hLib) {
-			handle_index = 4;
-			GET_HANDLE4;
-		}
-	}
-	if (hLib) {
-		freedv_get_version = GET_ADDR("freedv_get_version");
-		if (freedv_get_version != NULL) {
-			freedv_version = freedv_get_version();
-			if (DEBUG)
-				printf("FreeDV codec2 library %d found, version %d\n", handle_index, freedv_version);
-		}
-		else {
-			freedv_version = -2;
-			if (DEBUG)
-				printf("FreeDV codec2 library %d found, but no freedv_get_version() !!!\n", handle_index);
-			CLOSE_LIB;
-			return;
-		}
-	}
-	else {
-		handle_index = -1;
-		if (DEBUG)
-			printf("Could not find the FreeDV codec2 shared library\n");
-		return;
-	}
-
-// open, close
-	freedv_open = GET_ADDR("freedv_open");
-	freedv_open_advanced = GET_ADDR("freedv_open_advanced");
-	freedv_close = GET_ADDR("freedv_close");
-// Transmit
-	freedv_tx = GET_ADDR("freedv_tx");
-	freedv_comptx = GET_ADDR("freedv_comptx");
-// Receive
-	freedv_nin = GET_ADDR("freedv_nin");
-	freedv_rx = GET_ADDR("freedv_rx");
-	freedv_floatrx = GET_ADDR("freedv_floatrx");
-	freedv_comprx = GET_ADDR("freedv_comprx");
-// Set parameters
-	freedv_set_callback_txt = GET_ADDR("freedv_set_callback_txt");
-	freedv_set_callback_protocol = GET_ADDR("freedv_set_callback_protocol");
-	freedv_set_callback_data = GET_ADDR("freedv_set_callback_data");
-	freedv_set_test_frames = GET_ADDR("freedv_set_test_frames");
-	freedv_set_smooth_symbols = GET_ADDR("freedv_set_smooth_symbols");
-	freedv_set_squelch_en = GET_ADDR("freedv_set_squelch_en");
-	freedv_set_snr_squelch_thresh = GET_ADDR("freedv_set_snr_squelch_thresh");
-	freedv_set_tx_bpf = GET_ADDR("freedv_set_tx_bpf");
-// Get parameters
-	freedv_get_modem_stats = GET_ADDR("freedv_get_modem_stats");
-	freedv_get_test_frames = GET_ADDR("freedv_get_test_frames");
-	freedv_get_n_speech_samples = GET_ADDR("freedv_get_n_speech_samples");
-	freedv_get_n_max_modem_samples = GET_ADDR("freedv_get_n_max_modem_samples");
-	freedv_get_n_nom_modem_samples = GET_ADDR("freedv_get_n_nom_modem_samples");
-	freedv_get_total_bits = GET_ADDR("freedv_get_total_bits");
-	freedv_get_total_bit_errors = GET_ADDR("freedv_get_total_bit_errors");
-	freedv_get_sync = GET_ADDR("freedv_get_sync");		// requires version 11
-	if( freedv_version >= 11)
-		freedv_get_modem_sample_rate = GET_ADDR("freedv_get_modem_sample_rate");		// requires version 11 or later
-	if (freedv_version >= 12) 
-		freedv_get_speech_sample_rate = GET_ADDR("freedv_get_speech_sample_rate");		// requires version 12
-	return;
-}
-
-static int quisk_freedv_rx(short * sSamples, double * dsamples, int count, int bank)	// Called from the sound thread.
-{	// Input digital modulation is sSamples; decoded voice is dsamples.  Each "bank" is a stream of audio.
-	// caller will have decimated input audio down to n_modem_sample_rate and reduced block size to match reduction
-	// output data will be returned at n_speech_sample_rate with corresponding block sizes
-	int i, nout, need, have, sync;
-	int n_speech_samples;
-	struct freedv * hF;
-	struct _rx_channel * pCh;
-	int nCountOut = 1;	// In case we have a higher (or lower) value for o/p count
-
-	if (sSamples == NULL) {		// shutdown
-		for (i = 0; i < MAX_RECEIVERS; i++) {
-			if (rx_channel[i].demod_in) {
-				free(rx_channel[i].demod_in);
-				rx_channel[i].demod_in = NULL;
-			}
-		}
-		return 0;
-	}
-
-	if (bank < 0 || bank >= MAX_RECEIVERS)
-		return 0;
-	hF = rx_channel[bank].hFreedv;
-	if ( ! hF)
-		return 0;
-	pCh = rx_channel + bank;
-	n_speech_samples = freedv_get_n_speech_samples(hF);
-	// if (say) input modem rate is the 2020 mode rate of 8000 sa/sec
-	// and output rate is the corresponding 16000 sa/sec then for an input
-	// block size of N, outbut 2N samples block size.
-	// Apply a multiplier/divisor to 'count' for the output samples count
-	if(n_speech_sample_rate >= n_modem_sample_rate ) {
-		int nRatio = n_speech_sample_rate / n_modem_sample_rate;
-		if( nRatio >= 1 && nRatio <= 6)
-			nCountOut = nRatio * count;
-	}
-	else {
-		int nRatio = n_modem_sample_rate / n_speech_sample_rate;
-		if( nRatio >= 1 && nRatio <= 6)
-			nCountOut = count / nRatio;
-	}
-	nout = 0;
-	need = freedv_nin(hF);
-	for (i = 0; i < count; i++) {
-		pCh->demod_in[pCh->rxdata_index] = sSamples[i];
-		pCh->rxdata_index++;
-		if (pCh->rxdata_index >= need) {
-			if (pCh->speech_available + n_speech_samples < SPEECH_BUF_SIZE) {		// check for buffer space
-				have = freedv_rx(hF, pCh->speech_out + pCh->speech_available, pCh->demod_in);
-				if (freedv_version > 10)
-					sync = freedv_get_sync(hF);
-				else
-					freedv_get_modem_stats(hF, &sync, NULL);
-				if (freedv_current_mode == 0) {		// mode 1600
-					if (sync)		// throw away speech if not in sync
-						pCh->speech_available += have;
-				}
-				else if (pCh->speech_available < SPEECH_BUF_SIZE * 2 / 3) {
-					pCh->speech_available += have;	// keep speech if there is space
-				}
-				else {
-					if (DEBUG) printf("Close to maximum in speech output buffer\n");
-				}
-			}
-			else {		// no space in buffer
-				if (DEBUG) printf("Overflow in speech output buffer\n");
-			}
-			pCh->rxdata_index = 0;
-			need = freedv_nin(hF);
-		}
-	}
-	if ( ! pCh->playing) {
-		if (pCh->speech_available >= 2 * n_speech_samples) {
-			pCh->playing = 1;
-		}
-		else {		// return zero samples
-			for (i = 0; i < nCountOut; i++)
-				dsamples[i] = 0;
-			//if (DEBUG) printf("Rx buffer playing %d available %d\n", pCh->playing, pCh->speech_available);
-			return nCountOut;
-		}
-	}
-	for (nout = 0; nout < pCh->speech_available && nout < nCountOut; nout++)
-		dsamples[nout] = pCh->speech_out[nout] * ((double)CLIP32 / CLIP16 * 0.99);
-	if (nout) {
-		pCh->speech_available -= nout;
-		memmove(pCh->speech_out, pCh->speech_out + nout, (pCh->speech_available) * sizeof(short));
-	}
-	if ( ! pCh->speech_available) {
-		pCh->playing = 0;
-		while (nout < nCountOut)
-			dsamples[nout++] = 0;
-	}
-	//if (DEBUG) printf("Rx buffer playing %d available %d\n", pCh->playing, pCh->speech_available);
-	return nout;
-}
-
-static int quisk_freedv_tx(complex double * cSamples, double * dsamples, int count, int is_real)	// Called from the sound thread.
-{	// Input voice samples are dsamples; output digital modulation is cSamples.
-	int i, nout;
-	int n_speech_samples;
-	int n_nom_modem_samples;
-	static COMP * mod_out = NULL;
-	static short * speech_in = NULL;
-	static int speech_index=0, mod_index=0;
-	// g8kbb - add for 800XA
-	static short *real_mod_out = NULL;
-
-	if (dsamples == NULL) {		// shutdown
-		return 0;	// nothing to do
-	}
-	if ( ! rx_channel[0].hFreedv)
-		return 0;
-	n_speech_samples = freedv_get_n_speech_samples(rx_channel[0].hFreedv);
-	n_nom_modem_samples = freedv_get_n_nom_modem_samples(rx_channel[0].hFreedv);
-	// find if need to output at faster rate
-	int nRatio = n_modem_sample_rate / n_speech_sample_rate;
-	if( nRatio < 1 || nRatio > 6 )
-		nRatio = 1;
-	if (mod_out == NULL) {		// initialize
-		mod_out = (COMP *)malloc(sizeof(COMP) * MAX_MODEM_SAMPLES);
-		memset(mod_out, 0, sizeof(COMP) * MAX_MODEM_SAMPLES);
-		speech_in = (short*)malloc(sizeof(short) * MAX_SPEECH_SAMPLES);
-		speech_index=0;
-		mod_index=0;
-		real_mod_out = (short *)malloc(sizeof(short) * MAX_MODEM_SAMPLES);
-		memset(real_mod_out, 0, sizeof(short) * MAX_MODEM_SAMPLES);
-		//if( DEBUG ) printf("Initialise tx buffer size = %d, i/p sample size = %d\n", n_nom_modem_samples, n_speech_samples );
-	}
-	nout = 0;
-	for (i = 0; i < count; i++) {
-		speech_in[speech_index++] = (short)dsamples[i];
-		if (speech_index >= n_speech_samples) {
-			// Calculate a new block, but first write out the rest of the old block
-			// 800xa uses real not complex
-			if( is_real ) {
-				for ( ; mod_index < n_nom_modem_samples; mod_index++)
-					cSamples[nout++] = real_mod_out[mod_index];
-				freedv_tx(rx_channel[0].hFreedv, real_mod_out, speech_in);
-			}
-			else {
-				for ( ; mod_index < n_nom_modem_samples; mod_index++)
-					cSamples[nout++] = mod_out[mod_index].real + I * mod_out[mod_index].imag;
-				freedv_comptx(rx_channel[0].hFreedv, mod_out, speech_in);
-			}
-			//if( DEBUG ) printf("Block processed, speech index=%d, n_speech_samples=%d, count=%d\n", speech_index, n_speech_samples, count );
-			mod_index = 0;
-			speech_index = 0;
-		}
-		else {		// write out samples
-			for( int j=0; j<nRatio; j++) {
-				if (mod_index < n_nom_modem_samples ) {
-					if( is_real ) {
-						cSamples[nout++] = real_mod_out[mod_index];
-					}
-					else {
-						cSamples[nout++] = mod_out[mod_index].real + I * mod_out[mod_index].imag;
-					}
-					mod_index++;
-				}
-			}
-		}
-	}
-	if (rxMode == FDV_L)
-		for (i = 0; i < nout; i++)
-			cSamples[i] = conj(cSamples[i]);
-	return nout;
-}
-
-#define TX_MSG_SIZE		80
-static char quisk_tx_msg[TX_MSG_SIZE];
-
-static char get_next_tx_char(void * callback_state)
-{
-	char c;
-	static int index = 0;
-
-	c = quisk_tx_msg[index++];
-	if (index >= TX_MSG_SIZE)
-		index = 0;
-	if ( ! c) {
-		index = 0;
-		c = quisk_tx_msg[index++];
-	}
-	return c;
-}
-
-#define RX_MSG_SIZE		80
-static char quisk_rx_msg[RX_MSG_SIZE + 1];
-
-static void put_next_rx_char(void * callback_state, char ch)
-{
-	if (ch == '\n' || ch == '\r')
-		ch = ' ';
-	if (ch < 32 || ch > 126)	// printable characters
-		return;
-	if (strlen(quisk_rx_msg) < RX_MSG_SIZE)
-		strncat(quisk_rx_msg, &ch, 1);
-}
-
-PyObject * quisk_freedv_get_rx_char(PyObject * self, PyObject * args)	// Called from the GUI thread.
-{
-	PyObject * txt;
-
-	if (!PyArg_ParseTuple (args, ""))
-		return NULL;
-	txt = PyString_FromString(quisk_rx_msg);
-	quisk_rx_msg[0] = 0;
-	return txt;
-}
-
-static void CloseFreedv(void)	// Called from the GUI thread or sound thread
-{
-	int i;
-
-	for (i = 0; i < MAX_RECEIVERS; i++) {
-		if (rx_channel[i].hFreedv) {
-			freedv_close(rx_channel[i].hFreedv);
-			rx_channel[i].hFreedv = NULL;
-		}
-	}
-	quisk_freedv_rx(NULL, NULL, 0, 0);
-	quisk_freedv_tx(NULL, NULL, 0, 0);
-	freedv_current_mode = -1;
-}
-
-static int OpenFreedv(void)	// Called from the GUI thread or sound thread
-{
-	int i;
-	struct freedv * hF;
-
-	if ( ! hLib)
-		GetAddrs();		// Get the entry points for funtions in the codec2 library
-	if (DEBUG) {	
-		switch (handle_index) {
-		case 1:
-			printf("freedv_open: system codec2 library found, version %d\n", freedv_version);
-			break;
-		case 2:
-			printf("freedv_open: codec2 library freedvpkg/libcodec2.dll|so found, version %d\n", freedv_version);
-			break;
-		case 3:
-		case 4:
-			printf("freedv_open: codec2 library freedvpkg/libcodec2_64 found, version %d\n", freedv_version);
-			break;
-		default:
-			printf("freedv_open: Could not find the FreeDV codec2 shared library\n");
-			break;
-		}
-	}
-	if (freedv_version < 10) {
-		CloseFreedv();
-		requested_mode = -1;
-		if (DEBUG)
-			printf("freedv_open: Failure because version is less than 10\n");
-		return 0;	// failure
-	}
-	if (requested_mode == FREEDV_MODE_2020) {
-		if (checkAvxSupport() == 0) {
-			CloseFreedv();
-			requested_mode = -1;
-			if (DEBUG)
-				printf("freedv_open: Failure because mode 2020 requires Avx support\n");
-			return 0;	// failure
-		}
-		if (handle_index >= 3) {	// Quisk provided codec2
-			CloseFreedv();
-			requested_mode = -1;
-			if (DEBUG)
-				printf("freedv_open: Failure because mode 2020 requires a system installation of codec2\n");
-			return 0;	// failure
-		}
-	}
-
-   	if ((requested_mode == FREEDV_MODE_700D || requested_mode == FREEDV_MODE_700E) && freedv_open_advanced) {
-       	struct freedv_advanced adv;
-	memset(&adv, 0, sizeof(adv));
-       	adv.interleave_frames = interleave_frames;
-       	hF = freedv_open_advanced(requested_mode, &adv);
-   	}
-	else {
-        	hF = freedv_open(requested_mode);
-	}
-	if (hF == NULL) {
-		CloseFreedv();
-		requested_mode = -1;
-		return 0;	// failure
-	}
-	rx_channel[0].hFreedv = hF;
-	quisk_dvoice_freedv(&quisk_freedv_rx, &quisk_freedv_tx);
-	if (quisk_tx_msg[0])
-		freedv_set_callback_txt(hF, &put_next_rx_char, &get_next_tx_char, NULL);
-	else
-		freedv_set_callback_txt(hF, &put_next_rx_char, NULL, NULL);
-	if (freedv_set_callback_protocol)
- 		freedv_set_callback_protocol(hF, NULL, NULL, NULL);
-	if (freedv_set_callback_data)
-		freedv_set_callback_data(hF, NULL, my_datatx, NULL);
-	freedv_set_squelch_en(hF, quisk_freedv_squelch);
-	if (freedv_set_tx_bpf)
-		freedv_set_tx_bpf(hF, quisk_set_tx_bpf);
-	n_max_modem_samples = freedv_get_n_max_modem_samples(hF);
-	n_speech_sample_rate = 8000;
-	if (freedv_version >= 12 && freedv_get_speech_sample_rate)
-		n_speech_sample_rate = freedv_get_speech_sample_rate(hF);
-	n_modem_sample_rate = 8000;
-	if (freedv_version >= 11 && freedv_get_modem_sample_rate)
-		n_modem_sample_rate = freedv_get_modem_sample_rate(hF);
-	for (i = 0; i < MAX_RECEIVERS; i++) {
-		rx_channel[i].rxdata_index = 0;
-		rx_channel[i].speech_available = 0;
-		rx_channel[i].playing = 0;
-		if (rx_channel[i].demod_in)
-			free(rx_channel[i].demod_in);
-		rx_channel[i].demod_in = (short *)malloc(sizeof(short) * n_max_modem_samples);
-		if( rx_channel[i].demod_in == NULL) {
-			CloseFreedv();
-			requested_mode = -1;
-			return 0; // failure
-		}
-		if (i > 0) {
-			rx_channel[i].hFreedv = freedv_open(requested_mode);
-			if (rx_channel[i].hFreedv)
-				freedv_set_squelch_en(rx_channel[i].hFreedv, quisk_freedv_squelch);
-		}
-	}
-	if (DEBUG) printf("n_nom_modem_samples %d\n", freedv_get_n_nom_modem_samples(rx_channel[0].hFreedv));
-	if (DEBUG) printf("n_speech_samples %d\n", freedv_get_n_speech_samples(rx_channel[0].hFreedv));
-	if (DEBUG) printf("n_max_modem_samples %d\n", n_max_modem_samples);
-	if (DEBUG) {
-	 	if (freedv_version >= 11) printf("modem_sample_rate %d\n", n_modem_sample_rate);
-		if (freedv_version >= 12) printf("speech_sample_rate %d\n", n_speech_sample_rate);
-	}
-	freedv_current_mode = requested_mode;
-	return 1;		// success
-}
-
-void quisk_check_freedv_mode(void)
-{	// see if we need to change the mode
-	if (requested_mode == freedv_current_mode)
-		return;
-	if (DEBUG) printf("Change in mode to %d\n", requested_mode);
-	CloseFreedv();
-	if (requested_mode >= 0)
-		OpenFreedv();
-	else
-		requested_mode = -1;
-}
-
-PyObject * quisk_freedv_open(PyObject * self, PyObject * args)	// Called from the GUI thread before freedv is open
-{
-	if (!PyArg_ParseTuple (args, ""))
-		return NULL;
-	return PyInt_FromLong(OpenFreedv());
-}
-
-PyObject * quisk_freedv_close(PyObject * self, PyObject * args)	// Called from the GUI thread.
-{
-	if (!PyArg_ParseTuple (args, ""))
-		return NULL;
-	requested_mode = -1;		// request close
-	Py_INCREF (Py_None);
-	return Py_None;
-}
-
-PyObject * quisk_freedv_set_options(PyObject * self, PyObject * args, PyObject * keywds)	// Called from the GUI thread.
-{  // Call with keyword arguments ONLY to change parameters.  Call before quisk_freedv_open() to set an initial mode.
-	int mode=-1;				// Call again to change the mode.
-	int bpf=-1;
-	char * ptMsg=NULL;
-	static char * kwlist[] = {"mode", "tx_msg", "DEBUG", "squelch", "interleave_frames", "set_tx_bpf", NULL} ;
-
-	if (!PyArg_ParseTupleAndKeywords (args, keywds, "|isiiii", kwlist, &mode, &ptMsg, &DEBUG, &quisk_freedv_squelch, &interleave_frames, &bpf))
-		return NULL;
-	if (ptMsg)
-		strMcpy(quisk_tx_msg, ptMsg, TX_MSG_SIZE);
-	if (bpf != -1) {
-		quisk_set_tx_bpf = bpf;
-		if (freedv_set_tx_bpf && rx_channel[0].hFreedv)
-			freedv_set_tx_bpf(rx_channel[0].hFreedv, quisk_set_tx_bpf);
-	}
-	if (mode == -1) {	// mode was not entered
-		;
-	}
-	else if (mode == FREEDV_MODE_700E && freedv_version >= 14) {
-		requested_mode = mode;
-	}
-	else if (mode == FREEDV_MODE_2020) {
-		if (checkAvxSupport() && handle_index <= 2 && freedv_version >= 13)
-			requested_mode = mode;
-	}
-	else if (freedv_version == 10) {
-		if (mode == 0)
-			requested_mode = mode;
-	}
-	else if (freedv_version == 11) {
-		if (mode <= 2)
-			requested_mode = mode;
-	}
-	else {
-		requested_mode = mode;
-	}
-	return PyInt_FromLong(requested_mode);	// Return the mode
-}
-
-PyObject * quisk_freedv_get_snr(PyObject * self, PyObject * args)	// Called from the GUI thread.
-{
-	float snr_est = 0.0;
-
-	if (!PyArg_ParseTuple (args, ""))
-		return NULL;
-	if (rx_channel[0].hFreedv)
-		freedv_get_modem_stats(rx_channel[0].hFreedv, NULL, &snr_est);
-	return PyFloat_FromDouble(snr_est);
-}
-
-PyObject * quisk_freedv_get_version(PyObject * self, PyObject * args)	// Called from the GUI thread.
-{
-	if (!PyArg_ParseTuple (args, ""))
-		return NULL;
-	if ( ! hLib)
-		GetAddrs();		// Get the entry points for funtions in the codec2 library
-	return PyInt_FromLong(freedv_version);
-}
-
-PyObject * quisk_freedv_set_squelch_en(PyObject * self, PyObject * args)	// Called from the GUI thread.
-{
-	int i,state;
-
-	if (!PyArg_ParseTuple (args, "i", &state))
-		return NULL;
-	quisk_freedv_squelch = state;
-	for (i = 0; i < MAX_RECEIVERS; i++) {
-		if( rx_channel[i].hFreedv )
-			freedv_set_squelch_en(rx_channel[i].hFreedv, state);
-	}
-	return PyInt_FromLong(state);
-}
-
-
+// This file is no longer used.
diff --git a/freedv.h b/freedv.h
index c894c7c..f5df7e1 100644
--- a/freedv.h
+++ b/freedv.h
@@ -1,24 +1 @@
-extern int freedv_current_mode;         // the current FreeDV running mode
-
-// available speech modes
-#define FREEDV_MODE_1600 0
-#define FREEDV_MODE_2400A 3
-#define FREEDV_MODE_2400B 4
-#define FREEDV_MODE_800XA 5
-#define FREEDV_MODE_700C 6
-#define FREEDV_MODE_700D 7
-#define FREEDV_MODE_700E 13
-#define FREEDV_MODE_2020 8
-#define FREEDV_MODE_2020B 16
-
-// available data modes
-#define FREEDV_MODE_FSK_LDPC 9
-#define FREEDV_MODE_DATAC1 10
-#define FREEDV_MODE_DATAC3 12
-#define FREEDV_MODE_DATAC0 14
-#define FREEDV_MODE_DATAC4 18
-#define FREEDV_MODE_DATAC13 19
-
-// Sample rates used
-#define FREEDV_FS_8000 8000
-#define FREEDV_FS_16000 16000
+// This header file is no longer used.
diff --git a/freedvpkg/README.txt b/freedvpkg/README.txt
index bf20708..68769c7 100644
--- a/freedvpkg/README.txt
+++ b/freedvpkg/README.txt
@@ -1,129 +1 @@
-
-Note:  The directory freedvpkg no longer contains source files.  It only contains copies of
-       the codec2 libraries for use by Quisk.  If any other files are present, delete them.
-
-FreeDV and Directory freedvpkg
-==============================
-
-FreeDV is the combination of the codec2 codec and the fdmdv modem.  It provides digital voice
-suitable for HF and VHF transmission.  Quisk has native (built-in) support for
-FreeDV.  Just push the FDV mode and talk.  This freedvpkg directory contains copies of the
-codec2 libraries for use by Quisk.
-
-You can also use the separate FreeDV program available at freedv.org, and the Quisk DGT-U mode
-which attaches to external digital programs. The setup is identical to fldigi and other external
-digital programs.
-
-Quisk will add the FDV button if specified on the Config/radio/Controls tab.
-If there is a problem with the freedv module, the button will be grayed out.
-
-The freedv module requires the codec2 library.  This library is included for Windows and for
-Ubuntu 18.04 LTS 32-bit and 64-bit.  For other systems (such as ARM) you will need to build another
-codec2.  Just try the FDV mode and see if it works.  It should always work on Windows, and may work
-on Linux.  If the FDV button is grayed out, you need a different codec2 than the one included.  Make
-a new codec2 library, and copy it to freedvpkg or to the correct system directory.
-
-2020 mode
-=========
-You can now use 2020 mode with Quisk.  Note however that 2020 mode requires a processor with AVX. 
-Also note a Raspberry PI (model 4B) does not have enough processing power even if neon is used
-and it is overclocked.
-
-There are two parts to this:
-1. build LPCNet
-2. rebuild codec2
-The details are found here: https://github.com/drowe67/codec2#freedv-2020-support-building-with-lpcnet
-
-Both liblpcnetfreedv and libcodec2 are needed.  If you are running under windows, the resultant
-liblpcnetfreedv.dll file needs to be placed in the quisk folder.  Libcodec2 may be placed in the
-quisk freedvpkg folder. Or install the DLL's in the correct system folders.
-
-Search Order
-============
-
-Quisk will search for a valid codec2 library in this order on Windows:
-1.  The system codec2 library installed outside of Quisk by another program.
-2.  freedvpkg/libcodec2.dll.     Not included. You can copy your own codec2 here but a system-wide installation is better.
-3.  freedvpkg/libcodec2_32.dll.  The 32-bit codec2 shipped with Quisk.
-4.  freedvpkg/libcodec2_64.dll.  The 64-bit codec2 shipped with Quisk.
-
-Quisk will search for a valid codec2 library in this order on Linux:
-1.  The system codec2 library installed outside of Quisk by another program.
-2.  freedvpkg/libcodec2.so.     Not included. You can copy your own codec2 here but a system-wide installation is better.
-3.  freedvpkg/libcodec2_32.so.  The 32-bit codec2 shipped with Quisk.
-4.  freedvpkg/libcodec2_64.so.  The 64-bit codec2 shipped with Quisk.
-
-How to Build a New codec2
-=========================
-
-The source for codec2 is available on github.  Or google for other sources or perhaps a pre-built library.
-If you need to compile codec2 from source, first change to a suitable directory (not the Quisk directory)
-and download the source with git:
-
-  git clone https://github.com/drowe67/codec2.git
-
-Then build codec2 using the directions found at https://github.com/drowe67/codec2/blob/master/INSTALL.
-The directions given below are current as of June 2020, but check for changes.
-Then copy the codec2 library to the freedvpkg directory under Quisk.
-
-Build a New codec2 on Linux
-===========================
-Create the codec2 shared library.  This assumes a 64-bit linux. Change the directory
-name from build_linux64 to build_linux32 for 32-bit linux.  Note the "../".
-
-  cd codec2
-  mkdir build_linux64
-  cd build_linux64
-  cmake -DCMAKE_BUILD_TYPE=Release ../
-  make
-  cd src
-  cp libcodec2.so my-quisk-directory/freedvpkg
-
-Build a New 32-bit codec2 on 64-bit Linux
-=========================================
-Make sure package libc6-dev-i386 is installed.
-Create the codec2 shared library.  Note the "../".
-
-  cd codec2
-  mkdir build_linux32
-  cd build_linux32
-  export CFLAGS=-m32
-  cmake -DCMAKE_BUILD_TYPE=Release ../
-  make
-  cd src
-  cp libcodec2.so my-quisk-directory/freedvpkg
-
-Build a New codec2 on Windows
-=============================
-For Windows you need to install MinGW-w64, MSYS2, and g++.  Use the mingw shell.  The Speex libraries
-are not needed by codec2, but are required for the Unit Test modules.  To build the Unit Test modules,
-you need to install Speex and add -DSPEEXDSP_INCLUDE_DIR=../speex/include/speex -DSPEEXDSP_LIBRARY=../speex/bin.
-
-  # Use mingw32.exe 32-bit shell:
-  cd codec2
-  mkdir build_win32
-  cd build_win32
-  cmake -G "MSYS Makefiles" -DCMAKE_BUILD_TYPE=Release -DUNITTEST=OFF  ../
-  make codec2
-  cd src
-  cp libcodec2.dll  my-quisk-directory/freedvpkg
-
-  # Use mingw64.exe 64-bit shell:
-  cd codec2
-  mkdir build_win64
-  cd build_win64
-  cmake -G "MSYS Makefiles" -DCMAKE_BUILD_TYPE=Release -DUNITTEST=OFF -DCMAKE_SYSTEM_PROCESSOR=x86_64 ../
-  make codec2
-  cd src
-  cp libcodec2.dll  my-quisk-directory/freedvpkg
-
-Testing
-=======
-You can just start Quisk and see if the FDV button is not grayed out, and FDV works.  Or you can
-test the import of freedv and look for error messages.
-
-  cd my-quisk-directory
-  python                                # Use the correct Python 2 or 3 in 32 or 64 bit
-    import _quisk
-    _quisk.freedv_get_version()         # This should return 13 or higher for a recent codec2
-
+This directory is no longer used by FreeDV. Please see the documentation.
diff --git a/freedvpkg/libcodec2_64.dll b/freedvpkg/libcodec2_64.dll
deleted file mode 100644
index 5c6ee52..0000000
Binary files a/freedvpkg/libcodec2_64.dll and /dev/null differ
diff --git a/freedvpkg/libcodec2_64.so b/freedvpkg/libcodec2_64.so
deleted file mode 100644
index dd68024..0000000
Binary files a/freedvpkg/libcodec2_64.so and /dev/null differ
diff --git a/microphone.c b/microphone.c
index 726f8df..cc8a99c 100644
--- a/microphone.c
+++ b/microphone.c
@@ -8,7 +8,6 @@
 #include <sys/types.h>
 #include "microphone.h"
 #include "filter.h"
-#include "freedv.h"
 
 #ifdef MS_WINDOWS
 #include <winsock2.h>
@@ -245,11 +244,9 @@ static void init_alc(struct alc * pt, int size)
 			case DGT_U:
 			case DGT_L:
 			case DGT_IQ:
-				pt->gain_now[i] = 1.4;
-				break;
 			case FDV_U:
 			case FDV_L:
-				pt->gain_now[i] = 2.0;
+				pt->gain_now[i] = 1.4;
 				break;
 			default:
 				pt->gain_now[i] = 1.0;
@@ -617,7 +614,7 @@ static int tx_filter_digital(complex double * filtered, int count)
 		quisk_filt_dInit(&filter1, quiskDgtFilt48Coefs, sizeof(quiskDgtFilt48Coefs)/sizeof(double));    // pass 1350, stop 1650
 	}
 	if ( ! filtered) {	// Change to rxMode
-		quisk_filt_tune(&filter1, 1650.0 / 48000, rxMode != DGT_L && rxMode != LSB);
+		quisk_filt_tune(&filter1, 1650.0 / 48000, rxMode != DGT_L && rxMode != LSB && rxMode != FDV_L);
 		return 0;
 	}
 	for (i = 0; i < count; i++)	// FIR bandpass filter; separate into I and Q
@@ -626,140 +623,6 @@ static int tx_filter_digital(complex double * filtered, int count)
 	return count;
 }
 
-static int tx_filter_freedv(complex double * filtered, int count, int encode)
-{	// Input samples are creal(filtered), output is filtered.
-	// This filter is used for digital voice.
-	// Changes by Dave Roberts, G8KBB, for additional modes June, 2020.
-	// Modified by N2ADR January, 2024.
-	int i;
-	// The input sample rate is mic_sample_rate, either 8000 or 48000 sps.
-	// The FreeDV codec requires an input speech_sample_rate of either 8000 or 16000 sps depending on the mode. Input is always real.
-	// The FreeDV codec will output samples at modem_sample_rate of 8000 or 48000 sps depending on the mode, and output may be real or complex.
-	double dtmp, magn, dsample;
-	int modem_sample_rate, speech_sample_rate, use_filter, is_real;
-	static int samples_size = 0;
-	static int do_init = 1;
-	static double aaa, bbb, ccc, Xmin, Xmax, Ymax;
-	static double time_long, time_short;
-	static double inMax=0.3;
-	static double * dsamples = NULL;
-	static struct quisk_cFilter filter1, filter2;
-	static struct quisk_dFilter filtDecim48to16, filtDecim16to8;;
-	static struct quisk_cFilter cfiltInterp8to48;
-
-	if (do_init) {		// initialization
-		//QuiskWavWriteOpen(&hWav, "jim.wav", 3, 1, 4, 8000, 1.0 / CLIP16);
-		do_init = 0;
-		quisk_filt_cInit(&filter1, quiskLpFilt48Coefs, sizeof(quiskLpFilt48Coefs)/sizeof(double));  // at 48000 sps pass 3000 stop 4000 times two plus 3000
-		quisk_filt_cInit(&filter2, quiskFilt53D2Coefs, sizeof(quiskFilt53D2Coefs)/sizeof(double));  // at 8000 sps pass 1500 stop 1800 times two plus 1500
-		quisk_filt_cInit(&cfiltInterp8to48, quiskLpFilt48Coefs, sizeof(quiskLpFilt48Coefs)/sizeof(double));
-		quisk_filt_dInit(&filtDecim48to16, quiskAudio24p3Coefs, sizeof(quiskAudio24p3Coefs)/sizeof(double));	// pass 6000 stop 8000
-		quisk_filt_dInit(&filtDecim16to8, quiskFilt16dec8Coefs, sizeof(quiskFilt16dec8Coefs)/sizeof(double));	// pass 3000 stop 4000
-		Ymax = pow(10.0,  - 1 / 20.0);				// maximum y
-		Xmax = pow(10.0,  3 / 20.0);				// x where slope is zero; for x > Xmax, y == Ymax
-		Xmin = Ymax - fabs(Ymax - Xmax);			// x where slope is 1 and y = x; start of compression
-		//printf ("Xmin %f\n", Xmin);
-		aaa = 1.0 / (2.0 * (Xmin - Xmax));			// quadratic
-		bbb = -2.0 * aaa * Xmax;
-		ccc = Ymax - aaa * Xmax * Xmax - bbb * Xmax;
-	}
-	switch (freedv_current_mode) {		// n_modem_sample_rate and n_speech_sample_rate may not be valid
-		case FREEDV_MODE_2400A:
-		case FREEDV_MODE_2400B:
-			use_filter = 1;		// center frequency 3000
-			is_real = 1;
-			modem_sample_rate = 48000;
-			speech_sample_rate = 8000;
-			break;
-		case FREEDV_MODE_2020:
-			use_filter = 0;
-			is_real = 0;
-			modem_sample_rate = 8000;
-			speech_sample_rate = 16000;
-			break;
-		case FREEDV_MODE_800XA:
-			use_filter = 2;		// center frequency 1500
-			is_real = 1;
-			modem_sample_rate = 8000;
-			speech_sample_rate = 8000;
-			break;
-		default:
-			use_filter = 0;
-			is_real = 0;
-			modem_sample_rate = 8000;
-			speech_sample_rate = 8000;
-			break;
-	}
-	if ( ! filtered) {	// rxMode changed
-		quisk_filt_tune((struct quisk_dFilter *)&filter1, 3000.0 / 48000.0, rxMode != FDV_L);
-		quisk_filt_tune((struct quisk_dFilter *)&filter2, 1500.0 / 8000.0, rxMode != FDV_L);
-		return 0;
-	}
-	// check size of dsamples[] buffer
-	if (count > samples_size) {
-		samples_size = count * 2;
-		if (dsamples)
-			free(dsamples);
-		dsamples = (double *)malloc(samples_size * sizeof(double));
-	}
-	// copy to dsamples[]
-	for (i = 0; i < count; i++)
-		dsamples[i] = creal(filtered[i]) / CLIP16;	// normalize to 1.0000
-	// Decimate to 8000 Hz or to 16000 depending on mode (and hence setting of sample rate)
-	if (quisk_sound_state.mic_sample_rate == 48000) {
-		switch (speech_sample_rate) {
-		case 16000:
-			count = quisk_dDecimate(dsamples, count, &filtDecim48to16, 3);
-			break;
-		case 8000:
-			count = quisk_dDecimate(dsamples, count, &filtDecim48to16, 3);
-			count = quisk_dDecimate(dsamples, count, &filtDecim16to8, 2);
-			break;
-		default:
-			QuiskPrintf("Failure to convert speech input rate in tx_filter_freedv\n");
-			break;
-		}
-	}
-	else if (quisk_sound_state.mic_sample_rate == 8000 && speech_sample_rate != 8000) {
-		QuiskPrintf("Failure to convert input rate in tx_filter_freedv\n");
-	}
-	// Measure average peak input audio level and limit
-	dtmp = 1.0 / speech_sample_rate;		// sample time
-	time_long   = 1.0 - exp(- dtmp / 3.000);
-	time_short  = 1.0 - exp(- dtmp / 0.005);
-	for (i = 0; i < count; i++) {
-		dsample = dsamples[i];
-		magn = fabs(dsample);
-		if (magn > inMax)
-			inMax = inMax * (1 - time_short) + time_short * magn;
-		else if(magn > mic_agc_level)
-			inMax = inMax * (1 - time_long) + time_long * magn;
-		else
-			inMax = inMax * (1 - time_long) + time_long * mic_agc_level;
-		dsample = dsample / inMax * Xmin * 0.7;
-		magn = fabs(dsample);
-		if (magn < Xmin)
-			dsamples[i] = dsample;
-		else if (magn > Xmax)
-			dsamples[i] = copysign(Ymax, dsample);
-		else
-			dsamples[i] = copysign(aaa * magn * magn + bbb * magn + ccc, dsample);
-		dsamples[i] = dsamples[i] * CLIP16;
-	}
-	//QuiskWavWriteD(&hWav, dsamples, count);
-	if (encode && pt_quisk_freedv_tx)   // Encode audio into digital modulation
-		count = (* pt_quisk_freedv_tx)(filtered, dsamples, count, is_real);
-	//quisk_calc_audio_graph(CLIP16, filtered, NULL, count, 0);
-	if (use_filter == 1)	// convert float samples to complex with an analytic filter
-		count = quisk_cCDecimate(filtered, count, &filter1, 1);
-	else if (use_filter == 2)
-		count = quisk_cCDecimate(filtered, count, &filter2, 1);
-	// Interpolate up to 48000
-	if (MIC_OUT_RATE != modem_sample_rate ) 
-		count = quisk_cInterpolate(filtered, count, &cfiltInterp8to48, MIC_OUT_RATE / modem_sample_rate);
-	return count;
-}
-
 PyObject * quisk_get_tx_filter(PyObject * self, PyObject * args)
 {  // return the TX filter response to display on the graph
 // This is for debugging.  Change quisk.py to call QS.get_tx_filter() instead
@@ -1397,6 +1260,8 @@ int quisk_process_microphone(int mic_sample_rate, complex double * cSamples, int
 		case DGT_L:
 		case DGT_IQ:
 		case DGT_FM:
+		case FDV_U:		// FreeDV
+		case FDV_L:
 			count = tx_filter_digital(cSamples, count);	// filter samples, minimal processing
 			process_alc(cSamples, count, &tx_alc, rxMode);
 			break;
@@ -1404,11 +1269,6 @@ int quisk_process_microphone(int mic_sample_rate, complex double * cSamples, int
 			count *= interp;
 			transmit_mic_imd(cSamples, count, quiskImdLevel / 1000.0);
 			break;
-		case FDV_U:	// FDV
-		case FDV_L:
-			count = tx_filter_freedv(cSamples, count, 1);
-			process_alc(cSamples, count, &tx_alc, rxMode);
-			break;
 		default:
 			break;
 		}
@@ -1499,11 +1359,6 @@ int quisk_process_microphone(int mic_sample_rate, complex double * cSamples, int
 			count = tx_filter(cSamples, count);
 			process_alc(cSamples, count, &tx_alc, rxMode);
 			break;
-		case FDV_U:	// FDV
-		case FDV_L:
-			count = tx_filter_freedv(cSamples, count, 0);
-			process_alc(cSamples, count, &tx_alc, rxMode);
-			break;
 		default:
 			for (i = 0; i < count; i++)
 				cSamples[i] = 0;
@@ -1673,7 +1528,6 @@ void quisk_set_tx_mode(void)	// called when the mode rxMode is changed
 	tx_filter(NULL, 0);
 	tx_filter_digital(NULL, 0);
 	transmit_udp(NULL, 0);
-	tx_filter_freedv(NULL, 0, 0);
 	serial_key_samples(NULL, 0);
 }
 
diff --git a/quisk.c b/quisk.c
index 781de63..c41709d 100644
--- a/quisk.c
+++ b/quisk.c
@@ -151,7 +151,6 @@ static int waterfall_scroll_mode = 1;		// draw the first lines multiple times
 static int quisk_use_sidetone;		// is there a sidetone volume control?
 static int hl2_txbuf_errors;		// errors in the Hermes-Lite2 Tx buffer
 static int hl2_txbuf_state;		// state machine for errors in the Hermes-Lite2 Tx buffer
-static int freedv_monitor;		// pass the Freedv audio to the speakers instead of to the demodulator
 static int softrock_correct_freq;	// gain and phase corrections for SoftRock
 static double softrock_correct_gain;
 static double softrock_correct_phase;
@@ -569,15 +568,10 @@ void QuiskWavClose(struct QuiskWav * hWav)
 }
 #endif
 
-// These are used for digital voice codecs
-ty_dvoice_codec_rx  pt_quisk_freedv_rx;
-ty_dvoice_codec_tx  pt_quisk_freedv_tx;
-
-void quisk_dvoice_freedv(ty_dvoice_codec_rx rx, ty_dvoice_codec_tx tx)
+void quisk_dvoice_freedv(void)		// Not used.
 {
-	pt_quisk_freedv_rx = rx;
-	pt_quisk_freedv_tx = tx;
 }
+
 #if 0
 static int fFracDecim(double * dSamples, int nSamples, double fdecim)
 {  // fractional decimation by fdecim > 1.0
@@ -1851,10 +1845,8 @@ static int quisk_process_decimate(complex double * cSamples, int nSamples, int b
 static int quisk_process_demodulate(complex double * cSamples, double * dsamples, int nSamples, int bank, int nFilter, rx_mode_type rx_mode)
 {	// Changes here will require changes to get_filter_rate();
 	int i;
-	bool isLSB;
 	complex double cx;
 	double d, di, dd;
-	static struct AgcState Agc1 = {0.3, 16000, 0}, Agc2 = {0.3, 16000, 0};
 //static int count=0;
 //static double phase=0;
 	static struct stStorage {
@@ -2090,6 +2082,7 @@ static int quisk_process_demodulate(complex double * cSamples, double * dsamples
 		MeasureSquelch[bank].squelch_active = MeasureSquelch[bank].squelch < squelch_level;
 		break;
 	case DGT_U:     // digital mode DGT-U at 48 ksps
+	case FDV_U:
 		if (filter_bandwidth[nFilter] < DGT_NARROW_FREQ) {	// filter at 6 ksps
 			quisk_filter_srate = quisk_decim_srate / 8;
 			nSamples = quisk_cDecim2HB45(cSamples, nSamples, &Storage[bank].HalfBand5);
@@ -2116,6 +2109,7 @@ static int quisk_process_demodulate(complex double * cSamples, double * dsamples
 		}
 		break;
 	case DGT_L:     // digital mode DGT-L
+	case FDV_L:
 		if (filter_bandwidth[nFilter] < DGT_NARROW_FREQ) {	// filter at 6 ksps
 			quisk_filter_srate = quisk_decim_srate / 8;
 			nSamples = quisk_cDecim2HB45(cSamples, nSamples, &Storage[bank].HalfBand5);
@@ -2154,102 +2148,6 @@ static int quisk_process_demodulate(complex double * cSamples, double * dsamples
 			}
 		}
 		break;
-	case FDV_U:	// digital voice
-	case FDV_L:	// Extra modes added by Dave Roberts, G8KBB, June 2020. Modified by N2ADR 2024.
-		quisk_check_freedv_mode();
-		// current coding assumes input rate n_modem_sample_rate is 8000 or 48000.
-		// decimate:
-		switch (n_modem_sample_rate) {
-		case 8000:
-			quisk_filter_srate = quisk_decim_srate / 6;
-			nSamples = quisk_cDecimate(cSamples, nSamples, &Storage[bank].filtDecim48to16, 3);
-			nSamples = quisk_cDecimate(cSamples, nSamples, &Storage[bank].filtDecim16to8, 2);
-			break;
-		case 48000:
-			quisk_filter_srate = quisk_decim_srate;
-			break;
-		default:
-			quisk_filter_srate = quisk_decim_srate / 6;
-			QuiskPrintf("Bad FreeDV modem rate in quisk_process_demodulate\n");
-			break;
-		}
-		// filter and demodulate to mono audio:
-		isLSB = (rx_mode == FDV_L);
-		complex double cBuf[nSamples];
-		for (i = 0; i < nSamples; i++) {
-			cx = cRxFilterOut(cSamples[i], bank, nFilter);
-			if (isLSB)
-				dd = creal(cx) + cimag(cx);
-			else
-				dd = creal(cx) - cimag(cx);
-			if(bank == 0) {
-				measure_audio_sum += dd * dd;
-				measure_audio_count += 1;
-			}
-			cBuf[i] = dd;
-		}
-		// Perhaps decimate by an additional fraction
-		if (quisk_decim_srate != 48000) {
-			dd = quisk_decim_srate / 48000.0;
-			nSamples = cFracDecim(cBuf, nSamples, dd);
-			quisk_decim_srate = 48000;
-		}
-		if (bank == 0)
-			process_agc(&Agc1, cBuf, nSamples, 0);
-		else
-			process_agc(&Agc2, cBuf, nSamples, 0);
-		// pass data decimated down to n_modem_sample_rate
-		// return data is at n_speech_sample_rate
-#if 0
-		static double dmax_in = 0;
-		for (i = 0; i < nSamples; i++) {
-			dd = fabs(creal(cBuf[i])) / CLIP16;
-			if (dd > dmax_in)
-				dmax_in = dd;
-		}
-		if (bank == 0 && measure_audio_count >= quisk_filter_srate * measure_audio_time) {
-			//printf("Max sample in %.0lf\n", dmax_in);
-			dmax_in = 0;
-		}
-#endif
-		if (nSamples > n_max_modem_samples) {
-			printf ("FreeDV: nSamples %d exceeds max_modem_samples %d\n", nSamples, n_max_modem_samples);
-			nSamples = n_max_modem_samples;
-		}
-		short sBuf[nSamples];
-		for (i = 0; i < nSamples; i++)
-			sBuf[i] = (short)(creal(cBuf[i]) / CLIP16);
-		if (freedv_monitor) {
-			for (i = 0; i < nSamples; i++)
-				dsamples[i] = (float)sBuf[i] * CLIP16;
-		}
-		else {
-			if (pt_quisk_freedv_rx)
-				nSamples = (* pt_quisk_freedv_rx)(sBuf, dsamples, nSamples, bank);
-		}
-#if 0
-		static double dmax_out = 0;
-		for (i = 0; i < nSamples; i++) {
-			dd = fabs(dsamples[i]) / CLIP16;
-			if (dd > dmax_out)
-				dmax_out = dd;
-		}
-		if (bank == 0 && measure_audio_count >= quisk_filter_srate * measure_audio_time) {
-			//printf("      Max sample out %.0lf\n", dmax_out);
-			dmax_out = 0;
-		}
-#endif
-		// current coding assumes output rate n_speech_sample_rate is 8000 or 16000
-		switch (n_speech_sample_rate) {
-		case 8000:
-			nSamples = quisk_dInterpolate(dsamples, nSamples, &Storage[bank].filtAudio24p3, 3);
-			nSamples = quisk_dInterp2HB45(dsamples, nSamples, &Storage[bank].HalfBand7);
-			break;
-		case 16000:
-			nSamples = quisk_dInterpolate(dsamples, nSamples, &Storage[bank].filtAudio24p3, 3);
-			break;
-		}
-		break;
 	}
 	if (bank == 0 && measure_audio_count >= quisk_filter_srate * measure_audio_time) {
 		measured_audio = sqrt(measure_audio_sum / measure_audio_count) / CLIP32 * 1e6;
@@ -2785,9 +2683,6 @@ start_agc:
 	if (rxMode == EXT || rxMode == DGT_IQ) {		// Ext and DGT-IQ stereo sound
 		process_agc(&Agc1, cSamples, nSamples, 1);
 	}
-	else if (rxMode == FDV_U || rxMode == FDV_L) {	// Agc already done
-		;
-	}
 	else if (split_rxtx || multirx_play_channel >= 0) {		// separate AGC for left and right channels
 		for (i = 0; i < nSamples; i++) {
 			orig_cSamples[i] = cimag(cSamples[i]);
@@ -2945,6 +2840,8 @@ static PyObject * get_filter_rate(PyObject * self, PyObject * args)
 		break;
 	case DGT_U:     // digital modes DGT-*
 	case DGT_L:
+	case FDV_U:	 // digital voice
+	case FDV_L:
 		if (bandwidth < DGT_NARROW_FREQ)
 			filter_srate = decim_srate / 8;
 		else
@@ -2953,10 +2850,6 @@ static PyObject * get_filter_rate(PyObject * self, PyObject * args)
 	case DGT_IQ:	// digital mode at 48 ksps
 		filter_srate = decim_srate;
 		break;
-	case FDV_U:	 // digital voice
-	case FDV_L:
-		filter_srate = n_modem_sample_rate;
-		break;
 	}
 	//QuiskPrintf("Filter rate %d\n", filter_srate);
 	return PyInt_FromLong(filter_srate);
@@ -3196,14 +3089,13 @@ static PyObject * set_params(PyObject * self, PyObject * args, PyObject * keywds
 {  /* Call with keyword arguments ONLY; change local parameters */
 	static char * kwlist[] = {"quisk_is_vna", "rx_bytes", "rx_endian", "read_error", "clip", 
 	"bscope_bytes", "bscope_endian", "bscope_size", "bandscopeScale", "hermes_pause", 
-	"freedv_monitor", NULL} ;
+	NULL} ;
 	int i, nbytes, read_error, clip, bscope_size, hermes_pause;
 
 	nbytes = read_error = clip = bscope_size = hermes_pause = -1;
 	if (!PyArg_ParseTupleAndKeywords (args, keywds, "|iiiiiiiidii", kwlist,
 	&quisk_is_vna, &nbytes, &py_sample_rx_endian, &read_error, &clip,
-	&py_bscope_bytes, &py_bscope_endian, &bscope_size, &bandscopeScale, &hermes_pause,
-	&freedv_monitor))
+	&py_bscope_bytes, &py_bscope_endian, &bscope_size, &bandscopeScale, &hermes_pause))
 		return NULL;
 	if (nbytes != -1) {
 		py_sample_rx_bytes = nbytes;
@@ -6269,13 +6161,6 @@ static PyMethodDef QuiskMethods[] = {
 	{"set_cwkey", set_hardware_cwkey, METH_VARARGS, "Change the CW key up/down state."},
 	{"set_remote_cwkey", set_remote_cwkey, METH_VARARGS, "Change the remote control CW key up/down state."},
 	{"set_PTT", set_PTT, METH_VARARGS, "Record the PTT button state."},
-	{"freedv_open", quisk_freedv_open, METH_VARARGS, "Open FreeDV."},
-	{"freedv_close", quisk_freedv_close, METH_VARARGS, "Close FreeDV."},
-	{"freedv_get_snr", quisk_freedv_get_snr, METH_VARARGS, "Return the signal to noise ratio in dB."},
-	{"freedv_get_version", quisk_freedv_get_version, METH_VARARGS, "Return the codec2 API version."},
-	{"freedv_get_rx_char", quisk_freedv_get_rx_char, METH_VARARGS, "Get text characters received from freedv."},
-	{"freedv_set_options", (PyCFunction)quisk_freedv_set_options, METH_VARARGS|METH_KEYWORDS, "Set the freedv parameters."},
-	{"freedv_set_squelch_en", quisk_freedv_set_squelch_en, METH_VARARGS, "Enable or disable FreeDV squelch."},
 	{"wdsp_set_parameter", (PyCFunction)quisk_wdsp_set_parameter, METH_VARARGS|METH_KEYWORDS, "Set parameters for the WDSP SDR library."},
 	{"tmp_record_save", tmp_record_save, METH_VARARGS, "Save the temporary recording in a WAV file."},
 	{"watfall_RgbData", watfall_RgbData, METH_VARARGS, "Return a cookie for the Waterfall pixel data."},
diff --git a/quisk.h b/quisk.h
index 696296b..d22f73f 100644
--- a/quisk.h
+++ b/quisk.h
@@ -312,10 +312,6 @@ extern int quisk_active_sidetone;		// Whether and how to generate a sidetone
 extern int quisk_isFDX;				// Are we in full duplex mode?
 extern int quisk_use_serial_port;		// Are we using the serial port for CW key or PTT?
 extern play_state_t quisk_play_state;		// startup, receiving, sidetone
-extern int freedv_current_mode;			// current FreeDV mode; 700D, @)@) etc.
-extern int n_modem_sample_rate;			// Receive data, decimate to modem_sample_rate, FreeDV codec output data at speech_sample_rate
-extern int n_speech_sample_rate;		// Microphone decimate to speech_sample_rate, Freedv codec output data at modem_sample_rate, interpolate to 48000
-extern int n_max_modem_samples;			// maximum input to freedv_rx()
 extern int quisk_start_cw_delay;		// milliseconds to delay output on serial or MIDI CW key down
 extern int quisk_start_ssb_delay;		// milliseconds to discard output for all modes except CW
 extern struct sound_dev * quiskPlaybackDevices[];	// array of Playback sound devices
@@ -346,14 +342,7 @@ extern PyObject * quisk_set_hermes_filter(PyObject *, PyObject *);
 extern PyObject * quisk_set_alex_hpf(PyObject *, PyObject *);
 extern PyObject * quisk_set_alex_lpf(PyObject *, PyObject *);
 
-extern PyObject * quisk_freedv_open(PyObject *, PyObject *);
-extern PyObject * quisk_freedv_close(PyObject *, PyObject *);
-extern PyObject * quisk_freedv_get_snr(PyObject *, PyObject *);
-extern PyObject * quisk_freedv_get_version(PyObject *, PyObject *);
-extern PyObject * quisk_freedv_get_rx_char(PyObject *, PyObject *);
-extern PyObject * quisk_freedv_set_options(PyObject *, PyObject *, PyObject *);
 extern PyObject * quisk_set_sparams(PyObject *, PyObject *, PyObject *);
-extern PyObject * quisk_freedv_set_squelch_en(PyObject *, PyObject *);
 extern PyObject * quisk_open_key(PyObject *, PyObject *, PyObject *);
 extern PyObject * quisk_close_key(PyObject *, PyObject *);
 extern PyObject * quisk_set_sound_name(PyObject *, PyObject *);
@@ -397,7 +386,6 @@ void quisk_file_playback(complex double *, int, double);
 void quisk_tmp_playback(complex double *, int, double);
 void quisk_hermes_tx_send(int, int *);
 void quisk_udp_mic_error(char *);
-void quisk_check_freedv_mode(void);
 void quisk_calc_audio_graph(double, complex double *, double *, int, int);
 double QuiskDeltaSec(int);
 void * quisk_make_sidetone(struct sound_dev *, int);
@@ -407,12 +395,6 @@ void quisk_set_play_state(void);
 void quisk_poll_hardware_key(void);
 void PreDistort(complex double * amp_in_samples, complex double * amp_out_samples, int nSamples, complex double * tx_samples, int num_tx);
 
-// Functions supporting digital voice codecs
-typedef int  (* ty_dvoice_codec_rx)(short *, double *, int, int);
-typedef int  (* ty_dvoice_codec_tx)(complex double *, double *, int, int);
-extern ty_dvoice_codec_rx  pt_quisk_freedv_rx;
-extern ty_dvoice_codec_tx  pt_quisk_freedv_tx;
-
 // Driver function definitions=================================================
 int  quisk_read_alsa(struct sound_dev *, complex double *);
 void quisk_play_alsa(struct sound_dev *, int, complex double *, int, double);
@@ -468,7 +450,7 @@ int import_quisk_api(void);	// used to initialize Quisk_API
 #define QuiskSleepMicrosec	(*(	void	(*)	(int)			)Quisk_API[5])
 #define QuiskPrintTime		(*(	void	(*)	(const char *, int)	)Quisk_API[6])
 #define quisk_sample_source	(*(	void	(*)	(ty_sample_start, ty_sample_stop, ty_sample_read)	)Quisk_API[7])
-#define quisk_dvoice_freedv	(*(	void	(*)	(ty_dvoice_codec_rx, ty_dvoice_codec_tx)        	)Quisk_API[8])
+#define quisk_dvoice_freedv	(*(	void	(*)	(void)	        	)Quisk_API[8])
 #define quisk_is_key_down	(*(	int	(*)	(void)			                                )Quisk_API[9])
 #define quisk_sample_source4	(*(	void	(*)	(ty_sample_start, ty_sample_stop, ty_sample_read, ty_sample_write)	)Quisk_API[10])
 #define strMcpy                 (*(     char *  (*)     (char *, const char *, size_t)                          )Quisk_API[11])
@@ -483,7 +465,7 @@ double	QuiskTimeSec(void);
 void	QuiskSleepMicrosec(int);
 void	QuiskPrintTime(const char *, int);
 void	quisk_sample_source(ty_sample_start, ty_sample_stop, ty_sample_read);
-void	quisk_dvoice_freedv(ty_dvoice_codec_rx, ty_dvoice_codec_tx);
+void	quisk_dvoice_freedv(void);
 int	quisk_is_key_down(void);
 void	quisk_sample_source4(ty_sample_start, ty_sample_stop, ty_sample_read, ty_sample_write);
 char *  strMcpy(char *, const char *, size_t);
diff --git a/quisk.py b/quisk.py
index 8bfe03c..a0c6b68 100644
--- a/quisk.py
+++ b/quisk.py
@@ -292,9 +292,9 @@ class HamlibHandlerSerial:
 
   # Additional logic contributed by Dr. Karsten Schmidt
 
-  Mo2CoKen = {'CWL':7, 'CWU':3, 'LSB':1, 'USB':2, 'AM':5, 'FM':4, 'DGT-U':9, 'DGT-L':6, 'DGT-FM':4, 'DGT-IQ':9}
+  Mo2CoKen = {'CWL':7, 'CWU':3, 'LSB':1, 'USB':2, 'AM':5, 'FM':4, 'DGT-U':9, 'FDV-U':9, 'DGT-L':6, 'FDV-L':6, 'DGT-FM':4, 'DGT-IQ':9}
   Co2MoKen = {1:'LSB', 2:'USB', 3:'CWU', 4:'FM', 5:'AM', 6:'DGT-L', 7:'CWL', 9:'DGT-U'}
-  Mo2CoFlex = {'CWL':3, 'CWU':4, 'LSB':0, 'USB':1, 'AM':6, 'FM':5, 'DGT-U':7, 'DGT-L':9, 'DGT-FM':5, 'DGT-IQ':7}
+  Mo2CoFlex = {'CWL':3, 'CWU':4, 'LSB':0, 'USB':1, 'AM':6, 'FM':5, 'DGT-U':7, 'FDV-U':7, 'DGT-L':9, 'FDV-L':9, 'DGT-FM':5, 'DGT-IQ':7}
   Co2MoFlex = {0:'LSB', 1:'USB', 3:'CWL', 4:'CWU', 5:'FM', 6:'AM', 7:'DGT-U', 9:'DGT-L'}
   ConvertZZAC_P1_2_Step = { 0:     1,
                           1:    10,
@@ -1061,9 +1061,9 @@ class HamlibHandlerRig2:	# Test with telnet localhost 4532
       mode = 'CW'
     elif mode == 'CWL':		# Is this what CWR means?
       mode = 'CWR'
-    elif mode == 'DGT-U':
+    elif mode in ('DGT-U', 'FDV-U'):
       mode = 'PKTUSB'
-    elif mode == 'DGT-L':
+    elif mode in ('DGT-L', 'FDV-L'):
       mode = 'PKTLSB'
     elif mode == 'DGT-FM':
       mode = 'PKTFM'
@@ -3727,7 +3727,7 @@ class App(wx.App):
   'txAudioPreemphUsb', 'txAudioPreemphAm', 'txAudioPreemphFm', 'txAudioPreemphFdv',
   'wfallScaleZ', 'wfallGrScaleZ', 'graphScaleZ', 'split_rxtx_play', 'modeFilter',
   'file_name_rec_audio', 'file_name_rec_samples', 'file_name_rec_mic', 'file_name_rec_tmp',
-  'file_name_play_audio', 'file_name_play_samples', 'file_name_play_cq', 'freedv_mode',
+  'file_name_play_audio', 'file_name_play_samples', 'file_name_play_cq',
   'file_play_source', 'hermes_LNA_dB']
   def __init__(self):
     global application
@@ -3948,8 +3948,6 @@ class App(wx.App):
     self.hot_key_ptt_active = False
     self.serial_ptt_active = False
     self.vox_ptt_active = False
-    self.freedv_mode = 'Mode 700D'		# restore FreeDV mode setting
-    self.freedv_menu = None
     self.hermes_LNA_dB = 20
     if hasattr(Hardware, "OnChangeRxTx"):
       self.want_RxTx = True
@@ -4711,8 +4709,6 @@ class App(wx.App):
       self.hamlib_com1_handler.close()
     if self.hamlib_com2_handler:
       self.hamlib_com2_handler.close()
-    if conf.add_freedv_button:
-      QS.freedv_close()
     msg = QS.GetQuiskPrintf()
     if msg:
       print(msg, end='')
@@ -5051,14 +5047,9 @@ class App(wx.App):
     self.config_screen.config.EnableRecPlay()
     ### Right bank of buttons
     mode_names = ['CWL', 'CWU', 'LSB', 'USB', 'AM', 'FM', 'DGT-U', 'DGT-L', 'DGT-FM', 'DGT-IQ', 'FDV-U', 'FDV-L', 'IMD']
-    labels = [('CWL', 'CWU'), ('LSB', 'USB'), 'AM', 'FM', ('DGT-U', 'DGT-L', 'DGT-FM', 'DGT-IQ')]
-    shortcuts = ['C', 'S', 'A', 'M', 'D']
-    count = 5	# There is room for seven buttons
-    if conf.add_freedv_button:
-      n_freedv = count
-      count += 1
-      labels.append('FDV-U')
-      shortcuts.append('F')
+    labels = [('CWL', 'CWU'), ('LSB', 'USB'), 'AM', 'FM', ('DGT-U', 'DGT-L', 'DGT-FM', 'DGT-IQ'), ('FDV-U', 'FDV-L')]
+    shortcuts = ['C', 'S', 'A', 'M', 'D', 'F']
+    count = 6	# There is room for seven buttons
     if conf.add_imd_button:
       n_imd = count
       count += 1
@@ -5080,43 +5071,11 @@ class App(wx.App):
       self.modeButns.buttons[0].idName = "CW U/L"
       self.modeButns.buttons[1].idName = "SSB U/L"
       self.modeButns.buttons[4].idName = "DGT"
+      self.modeButns.buttons[5].idName = "FDV"
     else:
       labels = ['CWL', 'CWU', 'LSB', 'USB', 'AM', 'FM', 'DGT-U', 'DGT-L', 'DGT-FM', 'DGT-IQ', 'FDV-U', 'IMD']
       self.modeButns = RadioBtnPopup(frame, self.OnBtnMode, labels, None, 'modeButns')
     self.modeButns.idName = "modeButns"
-    self.freedv_menu_items = {}
-    if conf.add_freedv_button:
-      self.freedv_menu = QuiskMenu("freedv_menu")
-      msg = conf.freedv_tx_msg
-      QS.freedv_set_options(mode=conf.freedv_modes[0][1], tx_msg=msg, DEBUG=0, squelch=1)
-      self.freedv_menu.AppendCheckItem("Monitor", self.OnFreedvMonitor)
-      self.freedv_menu.AppendSeparator()
-      for mode, index in conf.freedv_modes:
-        item = self.freedv_menu.AppendRadioItem(mode, self.OnFreedvMenu, mode == self.freedv_mode)
-        self.freedv_menu_items[index] = item
-        if mode == self.freedv_mode:	# Restore mode
-          QS.freedv_set_options(mode=index)
-        if mode in ("Mode 2020", "Mode 2400A", "Mode 2400B"):
-          item.Enable(False)
-      if conf.button_layout == 'Large screen':
-        b = QuiskCycleCheckbutton(frame, None, ('FDV-U', 'FDV-L'), is_radio=True)
-        b.idName = "FDV"
-        b.char_shortcut = 'F'
-        self.btnFreeDV = WrapMenu(b, self.freedv_menu)
-        self.modeButns.ReplaceButton(n_freedv, self.btnFreeDV)
-      else:
-        self.btnFreeDV = self.modeButns.AddMenu('FDV-U', self.freedv_menu)
-      try:
-        ok = QS.freedv_open()
-      except:
-        traceback.print_exc()
-        ok = 0
-      if not ok:
-        conf.add_freedv_button = False
-        if conf.button_layout == 'Large screen':
-          self.modeButns.GetButtons()[n_freedv].Enable(0)
-        else:
-          self.modeButns.Enable('FDV-U', False)
     if conf.add_imd_button:
       val = 1000
       QS.set_imd_level(val)
@@ -5395,16 +5354,6 @@ class App(wx.App):
     t = '%13.2f' % (QS.measure_frequency(-1) + vfo)
     t = t[0:4] + ' ' + t[4:7] + ' ' + t[7:] + ' Hz'
     self.smeter.SetLabel(t)
-  def NewDVmeter(self):
-    if conf.add_freedv_button:
-      snr = QS.freedv_get_snr()
-      txt = QS.freedv_get_rx_char()
-      self.graph.ScrollMsg(txt)
-      self.waterfall.ScrollMsg(txt)
-    else:
-      snr = 0.0
-    t = "  SNR %3.0f" % snr
-    self.smeter.SetLabel(t)
   def NewSmeter(self):
     self.smeter_db_count += 1		# count for average
     x = QS.get_smeter()
@@ -5574,66 +5523,6 @@ class App(wx.App):
     self.multi_rx_screen.waterfall.pane2.filter_center = center
     if self.screen is self.filter_screen:
       self.screen.NewFilter()
-  def OnFreedvMonitor(self, event):
-    for item in self.freedv_menu.GetMenuItems():
-      if item.GetKind() == wx.ITEM_CHECK:
-        if item.IsChecked():
-          QS.set_params(freedv_monitor=1)
-        else:
-          QS.set_params(freedv_monitor=0)
-        break
-  def OnFreedvMenu(self, event):
-    text = ''
-    for item in self.freedv_menu.GetMenuItems():
-      kind = item.GetKind()
-      if kind != wx.ITEM_RADIO:
-        continue
-      if item.IsChecked():
-        text = item.GetItemLabel()
-        break
-    for mode, index in conf.freedv_modes:
-      if mode == text:
-        break
-    else:
-      print ("Failure in OnFreedvMenu")
-      return
-    mode = QS.freedv_set_options(mode=index)
-    if mode == index:
-      self.freedv_mode = text
-    elif not self.remote_control_slave:		# change to new mode failed
-      self.freedv_menu_items[mode].Check(1)
-      pos = (self.width//2, self.height//2)
-      if index == 8:
-        dlg = wx.MessageDialog(self.main_frame, "Quisk does not install %s. Please install a system-wide codec2." % text, "FreeDV Modes", wx.OK, pos)
-      else:
-        dlg = wx.MessageDialog(self.main_frame, "No codec2 support for " + text, "FreeDV Modes", wx.OK, pos)
-      dlg.ShowModal()
-    else:
-      self.freedv_menu_items[mode].Check(1)
-      print ("FreeDV change mode failed.")
-    self.OnChangeFilter()
-  def OnChangeFilter(self):
-    # Used by OnFreedvMenu because the FreeDV mode may change the filter sample rate
-    bw = int(self.filterButns.GetLabel())
-    # We can not use QS.get_filter_srate() because the FreeDV mode is not changed yet.
-    if self.freedv_mode in ("Mode 2400A", "Mode 2400B"):
-      frate = 48000;
-    else:
-      frate = 8000;
-    bw = min(bw, frate // 2)
-    self.filter_bandwidth = bw
-    center = self.GetFilterCenter(self.mode, bw)
-    filtI, filtQ = self.MakeFilterCoef(frate, None, bw, center)
-    lower_edge = center - bw // 2
-    QS.set_filters(filtI, filtQ, bw, lower_edge, 0)
-    self.multi_rx_screen.graph.filter_bandwidth = bw
-    self.multi_rx_screen.graph.filter_center = center
-    self.multi_rx_screen.waterfall.pane1.filter_bandwidth = bw
-    self.multi_rx_screen.waterfall.pane1.filter_center = center
-    self.multi_rx_screen.waterfall.pane2.filter_bandwidth = bw
-    self.multi_rx_screen.waterfall.pane2.filter_center = center
-    if self.screen is self.filter_screen:
-      self.screen.NewFilter()
   def OnBtnHelp(self, event):
     if event.GetEventObject().GetValue():
       self.OnBtnScreen(None, 'Help')
@@ -6098,11 +5987,6 @@ class App(wx.App):
         QS.set_squelch(self.levelSquelch / 12.0 - 120.0)
       else:
         QS.set_squelch(-999.0)
-    elif self.mode[0:3]  == 'FDV':
-      if value:
-        QS.freedv_set_squelch_en(1)
-      else:
-        QS.freedv_set_squelch_en(0)
     else:
       self.levelSquelchSSB = btn.slider_value
       if value:
@@ -6896,10 +6780,7 @@ class App(wx.App):
             d = 1E-10
           self.smeter.SetLabel(" ADC %.0f%% %.0fdB" % (d * 100.0, 20 * math.log10(d)))
         elif self.smeter_usage == "smeter":		# update the S-meter
-          if self.mode in ('FDV-U', 'FDV-L'):
-            self.NewDVmeter()
-          else:
-            self.NewSmeter()
+          self.NewSmeter()
         elif self.smeter_usage == "freq":
           self.MeasureFrequency()	# display measured frequency
         else:
diff --git a/quisk_conf_defaults.py b/quisk_conf_defaults.py
index 3e9b949..67d7086 100644
--- a/quisk_conf_defaults.py
+++ b/quisk_conf_defaults.py
@@ -1797,23 +1797,6 @@ add_extern_demod = ""
 add_fdx_button = 0
 #add_fdx_button = 1
 
-## add_freedv_button		Add FreeDv button, integer choice
-# These buttons add up to two additional mode buttons after CW, USB, etc.
-# Set this to add the FDV mode button for digital voice:
-add_freedv_button = 1
-#add_freedv_button = 0
-
-## freedv_tx_msg			FreeDv Tx message, text
-# For freedv, this is the text message to send.
-freedv_tx_msg = ''
-#freedv_tx_msg = 'N2XXX Jim, New Jersey, USA \n'
-
-
-# This is the list of FreeDV modes and their index number.  The starting mode is the first listed.
-freedv_modes = (('Mode 1600', 0), 
-		('Mode 2400A', 3), ('Mode 2400B', 4), ('Mode 800XA', 5),
-		('Mode 700C', 6), ('Mode 700D', 7), ('Mode 700E', 13), ('Mode 2020', 8))
-
 # These are the filter bandwidths for each mode.  Quisk has built-in optimized filters
 # for these values, but you can change them if you want.
 FilterBwCW	= (200, 400, 600, 1000, 1500, 3000)
diff --git a/setup.py b/setup.py
index 4fb20cd..b7bbc16 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@ import os
 # You must define the version here.  A title string including
 # the version will be written to __init__.py and read by quisk.py.
 
-Version = '4.2.44'
+Version = '4.2.45'
 
 fp = open("__init__.py", "w")	# write title string
 fp.write("#Quisk version %s\n" % Version)
diff --git a/sound.c b/sound.c
index c2bce46..aab2415 100644
--- a/sound.c
+++ b/sound.c
@@ -1000,21 +1000,25 @@ int quisk_read_sound(void)	// Called from sound thread
 	if (remote_control_slave)
 		send_remote_radio_sound_socket(cSamples, nSamples);
 
-	is_DGT = rxMode == DGT_U || rxMode == DGT_L || rxMode == DGT_IQ || rxMode == DGT_FM;
+	is_DGT = (rxMode == DGT_U || rxMode == DGT_L || rxMode == DGT_IQ || rxMode == DGT_FM || rxMode == FDV_U || rxMode == FDV_L);
 	if (quisk_record_state == TMP_PLAY_SPKR_MIC)
 		quisk_tmp_playback(cSamples, nSamples, 1.0);		// replace radio sound
 	else if (quisk_record_state == FILE_PLAY_SPKR_MIC)
 		quisk_file_playback(cSamples, nSamples, file_play_level);		// replace radio sound
 	// Play the demodulated audio
 #if DEBUG_MIC != 2
-	if ( ! quisk_play_sidetone(&quisk_Playback))	// play sidetone
-		play_sound_interface(&quisk_Playback, nSamples, cSamples, 1, quisk_audioVolume);	// else play radio sound
+	if ( ! quisk_play_sidetone(&quisk_Playback)) {	// play sidetone
+		if (rxMode == FDV_U || rxMode == FDV_L)
+			play_sound_interface(&quisk_Playback, nSamples, cSamples, 1, 0);	// play silence
+		else
+			play_sound_interface(&quisk_Playback, nSamples, cSamples, 1, quisk_audioVolume);	// play radio sound
+	}
 #endif
 	if (radio_sound_socket != INVALID_SOCKET)
 		send_radio_sound_socket(cSamples, nSamples, quisk_audioVolume);
    
 	// Play digital if required
-	if (is_DGT)
+	//if (is_DGT)
 		play_sound_interface(&DigitalOutput, nSamples, cSamples, 1, digital_output_level);
    
 	// Perhaps record the speaker audio to a file
diff --git a/sound_pulseaudio.c b/sound_pulseaudio.c
index 66bd672..6b38c00 100644
--- a/sound_pulseaudio.c
+++ b/sound_pulseaudio.c
@@ -64,12 +64,20 @@ volatile int streams_to_start;
 // remember all open devices for easy cleanup on exit
 static pa_stream *OpenPulseDevices[PA_LIST_SIZE * 2] = {NULL};
 
-static int have_QuiskDigitalInput;	// Do we need to create this null sink?
-static int have_QuiskDigitalOutput;	// Do we need to create this null sink?
-
 static int underrunPlayback;
 static int tlength_bytes;
 
+// list of additional sink devices to add
+struct _NewSinks {
+	char * name;	// name of the new sink
+	int create;	// create the sink if it doesn't exist
+};
+#define NUM_NEW_SINKS	2
+static struct _NewSinks sink_list[NUM_NEW_SINKS] = {
+	{"QuiskDigitalInput", 1},
+	{"QuiskDigitalOutput", 1}
+};
+
 /* This callback happens any time a stream changes state. Here, it's primary used to 
  * tell the quisk thread when streams are ready. 
  */
@@ -1043,19 +1051,23 @@ static void source_sink(const char * name, const char * descr, pa_proplist * pro
 
 // pa_mainloop will call this function when it's ready to tell us about a sink.
 static void pa_sinklist_cb(pa_context *c, const pa_sink_info *l, int eol, void *userdata) {
-    if (eol > 0)	// If eol is set to a positive number, you're at the end of the list
+	int i;
+
+	if (eol > 0)	// If eol is set to a positive number, you're at the end of the list
 		return;
-    source_sink(l->name, l->description, l->proplist, (PyObject *)userdata);
-    if ( ! strcmp(l->name, "QuiskDigitalInput"))
-        have_QuiskDigitalInput = 1;
-    if ( ! strcmp(l->name, "QuiskDigitalOutput"))
-        have_QuiskDigitalOutput = 1;
+	source_sink(l->name, l->description, l->proplist, (PyObject *)userdata);
+	for (i = 0; i < NUM_NEW_SINKS; i++) {
+		if ( ! strcmp(l->name, sink_list[i].name)) {
+			sink_list[i].create = 0;
+		}
+	}
 }
 
-static void pa_sourcelist_cb(pa_context *c, const pa_source_info *l, int eol, void *userdata) {
-    if (eol > 0)
+static void pa_sourcelist_cb(pa_context *c, const pa_source_info *l, int eol, void *userdata)
+{
+	if (eol > 0)
 		return;
-    source_sink(l->name, l->description, l->proplist, (PyObject *)userdata);
+	source_sink(l->name, l->description, l->proplist, (PyObject *)userdata);
 }
 
 static void index_callback(pa_context *c, uint32_t idx, void *userdata) {
@@ -1070,6 +1082,9 @@ PyObject * quisk_pulseaudio_sound_devices(PyObject * self, PyObject * args)
 	pa_operation *pa_op=NULL;
 	pa_context *pa_names_ctx;
 	int state = 0;
+	int sink_index = 0;
+	char * sink_name;
+	char buf256[256];
 
 	if (!PyArg_ParseTuple (args, ""))
 		return NULL;
@@ -1113,59 +1128,41 @@ PyObject * quisk_pulseaudio_sound_devices(PyObject * self, PyObject * args)
 			pa_mainloop_iterate(pa_names_ml, 1, NULL);
 			break;
 		case 2:
-			// Now we wait for our operation to complete.  When it's
-			// complete our pa_output_devicelist is filled out, and we move
-			// along to the next state
 			if (pa_operation_get_state(pa_op) == PA_OPERATION_DONE) {
 				pa_operation_unref(pa_op);
-				// Now we perform another operation to get the source
-				// (input device) list just like before.
-				pa_op = pa_context_get_source_info_list(pa_names_ctx, pa_sourcelist_cb, pycapt);
-				// Update the state so we know what to do next
 				state++;
 			}
-			pa_mainloop_iterate(pa_names_ml, 1, NULL);
+			else
+				pa_mainloop_iterate(pa_names_ml, 1, NULL);
 			break;
+		// The following loads null sinks for digital input and output if they are not present.
 		case 3:
+			if (sink_index >= NUM_NEW_SINKS) {
+				state = 5;
+				continue;
+			}
+			if (sink_list[sink_index].create) {
+				sink_name = sink_list[sink_index].name;
+				snprintf(buf256, 256, "sink_name=%s sink_properties=device.description=%s", sink_name, sink_name);
+				pa_op = pa_context_load_module(pa_names_ctx, "module-null-sink", buf256, index_callback, NULL);
+				state++;
+			}
+			sink_index++;
+			break;
+		case 4:
 			if (pa_operation_get_state(pa_op) == PA_OPERATION_DONE) {
 				pa_operation_unref(pa_op);
-				state = 4;
+				state = 3;
 			}
 			else
 				pa_mainloop_iterate(pa_names_ml, 1, NULL);
 			break;
-		// The following loads modules for digital input and output if they are not present.
-		case 4:
-			if ( ! have_QuiskDigitalInput) {
-				pa_op = pa_context_load_module(pa_names_ctx, "module-null-sink",
-					"sink_name=QuiskDigitalInput sink_properties=device.description=QuiskDigitalInput",
-					index_callback, NULL);
-				state = 5;
-				pa_mainloop_iterate(pa_names_ml, 1, NULL);
-			}
-			else
-				state = 6;
-			break;
 		case 5:
-			if (pa_operation_get_state(pa_op) == PA_OPERATION_DONE) {
-				pa_operation_unref(pa_op);
-				state = 6;
-			}
-			else
-				pa_mainloop_iterate(pa_names_ml, 1, NULL);
+			pa_op = pa_context_get_source_info_list(pa_names_ctx, pa_sourcelist_cb, pycapt);
+			state++;
+			pa_mainloop_iterate(pa_names_ml, 1, NULL);
 			break;
 		case 6:
-			if ( ! have_QuiskDigitalOutput) {
-				pa_op = pa_context_load_module(pa_names_ctx, "module-null-sink",
-					"sink_name=QuiskDigitalOutput sink_properties=device.description=QuiskDigitalOutput",
-					index_callback, NULL);
-				state = 7;
-				pa_mainloop_iterate(pa_names_ml, 1, NULL);
-			}
-			else
-				state = 9;
-			break;
-		case 7:
 			if (pa_operation_get_state(pa_op) == PA_OPERATION_DONE) {
 				pa_operation_unref(pa_op);
 				state = 9;