diff --git a/src/AppFrame.cpp b/src/AppFrame.cpp
index df5e13c..2c80502 100644
--- a/src/AppFrame.cpp
+++ b/src/AppFrame.cpp
@@ -113,12 +113,12 @@ void AppFrame::OnIdle(wxIdleEvent& event) {
         wxGetApp().getAudioVisualQueue()->pop(demodAudioData);
         if (demodAudioData.data.size()) {
 
-            if (scopeCanvas->waveform_points.size() != demodAudioData.data.size()) {
-                scopeCanvas->waveform_points.resize(demodAudioData.data.size());
+            if (scopeCanvas->waveform_points.size() != demodAudioData.data.size()*2) {
+                scopeCanvas->waveform_points.resize(demodAudioData.data.size()*2);
             }
 
-            for (int i = 0, iMax = demodAudioData.data.size() / 2; i < iMax; i++) {
-                scopeCanvas->waveform_points[i * 2 + 1] = demodAudioData.data[i * 2] * 0.5f;
+            for (int i = 0, iMax = demodAudioData.data.size(); i < iMax; i++) {
+                scopeCanvas->waveform_points[i * 2 + 1] = demodAudioData.data[i] * 0.5f;
                 scopeCanvas->waveform_points[i * 2] = ((double) i / (double) iMax);
             }
 
diff --git a/src/audio/AudioThread.cpp b/src/audio/AudioThread.cpp
index 53a186f..b429ec3 100644
--- a/src/audio/AudioThread.cpp
+++ b/src/audio/AudioThread.cpp
@@ -11,7 +11,7 @@ std::map<int, std::thread *> AudioThread::deviceThread;
 
 AudioThread::AudioThread(AudioThreadInputQueue *inputQueue, DemodulatorThreadCommandQueue* threadQueueNotify) :
         inputQueue(inputQueue), terminated(false), audio_queue_ptr(0), underflow_count(0), threadQueueNotify(threadQueueNotify), gain(1.0), active(
-                false) {
+        false) {
 #ifdef __APPLE__
     boundThreads = new std::vector<AudioThread *>;
 #endif
@@ -65,14 +65,35 @@ static int audioCallback(void *outputBuffer, void *inputBuffer, unsigned int nBu
             continue;
         }
 
-        for (int i = 0; i < nBufferFrames * 2; i++) {
-            if (srcmix->audio_queue_ptr >= srcmix->currentInput.data.size()) {
+        if (srcmix->currentInput.channels == 0) {
+            if (!srcmix->inputQueue->empty()) {
                 srcmix->inputQueue->pop(srcmix->currentInput);
-                srcmix->audio_queue_ptr = 0;
             }
-            out[i] = out[i] + srcmix->currentInput.data[srcmix->audio_queue_ptr] * src->gain;
-            srcmix->audio_queue_ptr++;
+            continue;
         }
+
+        if (srcmix->currentInput.channels == 1) {
+            for (int i = 0; i < nBufferFrames; i++) {
+                if (srcmix->audio_queue_ptr >= srcmix->currentInput.data.size()) {
+                    srcmix->inputQueue->pop(srcmix->currentInput);
+                    srcmix->audio_queue_ptr = 0;
+                }
+                float v = srcmix->currentInput.data[srcmix->audio_queue_ptr] * src->gain;
+                out[i * 2] += v;
+                out[i * 2 + 1] += v;
+                srcmix->audio_queue_ptr++;
+            }
+        } else {
+            for (int i = 0, iMax = src->currentInput.channels * nBufferFrames; i < iMax; i++) {
+                if (srcmix->audio_queue_ptr >= srcmix->currentInput.data.size()) {
+                    srcmix->inputQueue->pop(srcmix->currentInput);
+                    srcmix->audio_queue_ptr = 0;
+                }
+                out[i] = out[i] + srcmix->currentInput.data[srcmix->audio_queue_ptr] * src->gain;
+                srcmix->audio_queue_ptr++;
+            }
+        }
+
     }
 
     return 0;
@@ -89,23 +110,42 @@ static int audioCallback(void *outputBuffer, void *inputBuffer, unsigned int nBu
         std::cout << "Audio buffer underflow.." << (src->underflow_count++) << std::endl;
     }
 
-    for (int i = 0; i < nBufferFrames * 2; i++) {
-        if (src->audio_queue_ptr >= src->currentInput.data.size()) {
-            if (src->terminated) {
-                break;
-            }
+    if (src->currentInput.channels == 0) {
+        if (!src->inputQueue->empty()) {
             src->inputQueue->pop(src->currentInput);
-            src->audio_queue_ptr = 0;
         }
-        out[i] = src->currentInput.data[src->audio_queue_ptr] * src->gain;
-        src->audio_queue_ptr++;
+        return 0;
     }
 
+    if (src->currentInput.channels == 1) {
+        for (int i = 0; i < nBufferFrames; i++) {
+            if (src->audio_queue_ptr >= src->currentInput.data.size()) {
+                if (src->terminated) {
+                    break;
+                }
+                src->inputQueue->pop(src->currentInput);
+                src->audio_queue_ptr = 0;
+            }
+            out[i * 2] = out[i * 2 + 1] = src->currentInput.data[src->audio_queue_ptr] * src->gain;
+            src->audio_queue_ptr++;
+        }
+    } else {
+        for (int i = 0, iMax = src->currentInput.channels * nBufferFrames; i < iMax; i++) {
+            if (src->audio_queue_ptr >= src->currentInput.data.size()) {
+                if (src->terminated) {
+                    break;
+                }
+                src->inputQueue->pop(src->currentInput);
+                src->audio_queue_ptr = 0;
+            }
+            out[i] = src->currentInput.data[src->audio_queue_ptr] * src->gain;
+            src->audio_queue_ptr++;
+        }
+    }
     return 0;
 }
 #endif
 
-
 void AudioThread::enumerateDevices() {
     int numDevices = dac.getDeviceCount();
 
@@ -158,7 +198,7 @@ void AudioThread::threadMain() {
 #ifdef __APPLE__
     pthread_t tID = pthread_self();	 // ID of this thread
     int priority = sched_get_priority_max( SCHED_RR) - 1;
-    sched_param prio = { priority }; // scheduling priority of thread
+    sched_param prio = {priority}; // scheduling priority of thread
     pthread_setschedparam(tID, SCHED_RR, &prio);
 #endif
 
diff --git a/src/audio/AudioThread.h b/src/audio/AudioThread.h
index e295555..9ea135a 100644
--- a/src/audio/AudioThread.h
+++ b/src/audio/AudioThread.h
@@ -22,6 +22,15 @@ class AudioThreadInput {
 public:
     int frequency;
     int sampleRate;
+    int channels;
+
+    AudioThreadInput(): frequency(0), sampleRate(0), channels(0) {
+
+    }
+
+    ~AudioThreadInput() {
+
+    }
 
     std::vector<float> data;
 };
diff --git a/src/demod/DemodDefs.h b/src/demod/DemodDefs.h
index 9e6ea0c..e5822c1 100644
--- a/src/demod/DemodDefs.h
+++ b/src/demod/DemodDefs.h
@@ -38,6 +38,21 @@ public:
 	int int_value;
 };
 
+class DemodulatorThreadControlCommand {
+public:
+    enum DemodulatorThreadControlCommandEnum {
+        DEMOD_THREAD_CMD_CTL_NULL,
+        DEMOD_THREAD_CMD_CTL_SQUELCH_AUTO,
+        DEMOD_THREAD_CMD_CTL_SQUELCH_OFF
+    };
+
+    DemodulatorThreadControlCommand() :
+            cmd(DEMOD_THREAD_CMD_CTL_NULL) {
+    }
+
+    DemodulatorThreadControlCommandEnum cmd;
+};
+
 class DemodulatorThreadIQData {
 public:
 	unsigned int frequency;
@@ -64,7 +79,7 @@ class DemodulatorThreadPostIQData {
 public:
 	std::vector<liquid_float_complex> data;
 	float audio_resample_ratio;
-	msresamp_crcf audio_resampler;
+	msresamp_rrrf audio_resampler;
     float resample_ratio;
     msresamp_crcf resampler;
 
@@ -106,6 +121,7 @@ public:
 typedef ThreadQueue<DemodulatorThreadIQData> DemodulatorThreadInputQueue;
 typedef ThreadQueue<DemodulatorThreadPostIQData> DemodulatorThreadPostInputQueue;
 typedef ThreadQueue<DemodulatorThreadCommand> DemodulatorThreadCommandQueue;
+typedef ThreadQueue<DemodulatorThreadControlCommand> DemodulatorThreadControlCommandQueue;
 
 
 class DemodulatorThreadParameters {
diff --git a/src/demod/DemodulatorInstance.cpp b/src/demod/DemodulatorInstance.cpp
index 48297de..9d46565 100644
--- a/src/demod/DemodulatorInstance.cpp
+++ b/src/demod/DemodulatorInstance.cpp
@@ -2,17 +2,18 @@
 
 DemodulatorInstance::DemodulatorInstance() :
         t_Demod(NULL), t_PreDemod(NULL), t_Audio(NULL), threadQueueDemod(NULL), demodulatorThread(NULL), terminated(false), audioTerminated(false), demodTerminated(
-        false), preDemodTerminated(false), active(false) {
+        false), preDemodTerminated(false), active(false), squelch(false) {
 
     label = new std::string("Unnamed");
     threadQueueDemod = new DemodulatorThreadInputQueue;
     threadQueuePostDemod = new DemodulatorThreadPostInputQueue;
     threadQueueCommand = new DemodulatorThreadCommandQueue;
     threadQueueNotify = new DemodulatorThreadCommandQueue;
+    threadQueueControl = new DemodulatorThreadControlCommandQueue;
 
-    demodulatorPreThread = new DemodulatorPreThread(threadQueueDemod, threadQueuePostDemod, threadQueueNotify);
+    demodulatorPreThread = new DemodulatorPreThread(threadQueueDemod, threadQueuePostDemod, threadQueueControl, threadQueueNotify);
     demodulatorPreThread->setCommandQueue(threadQueueCommand);
-    demodulatorThread = new DemodulatorThread(threadQueuePostDemod, threadQueueNotify);
+    demodulatorThread = new DemodulatorThread(threadQueuePostDemod, threadQueueControl, threadQueueNotify);
 
     audioInputQueue = new AudioThreadInputQueue;
     audioThread = new AudioThread(audioInputQueue, threadQueueNotify);
@@ -144,3 +145,30 @@ void DemodulatorInstance::setActive(bool state) {
     active = state;
     audioThread->setActive(state);
 }
+
+
+void DemodulatorInstance::squelchAuto() {
+    DemodulatorThreadControlCommand command;
+    command.cmd = DemodulatorThreadControlCommand::DEMOD_THREAD_CMD_CTL_SQUELCH_AUTO;
+    threadQueueControl->push(command);
+    squelch = true;
+}
+
+bool DemodulatorInstance::isSquelchEnabled() {
+    return squelch;
+}
+
+void DemodulatorInstance::setSquelchEnabled(bool state) {
+    if (!state && squelch) {
+        DemodulatorThreadControlCommand command;
+        command.cmd = DemodulatorThreadControlCommand::DEMOD_THREAD_CMD_CTL_SQUELCH_OFF;
+        threadQueueControl->push(command);
+    } else if (state && !squelch) {
+        DemodulatorThreadControlCommand command;
+        command.cmd = DemodulatorThreadControlCommand::DEMOD_THREAD_CMD_CTL_SQUELCH_AUTO;
+        threadQueueControl->push(command);
+    }
+
+    squelch = state;
+}
+
diff --git a/src/demod/DemodulatorInstance.h b/src/demod/DemodulatorInstance.h
index 9b759ce..ccd14be 100644
--- a/src/demod/DemodulatorInstance.h
+++ b/src/demod/DemodulatorInstance.h
@@ -16,6 +16,8 @@ public:
     DemodulatorThreadCommandQueue* threadQueueNotify;
     DemodulatorPreThread *demodulatorPreThread;
     DemodulatorThread *demodulatorThread;
+    DemodulatorThreadControlCommandQueue *threadQueueControl;
+
 #ifdef __APPLE__
     pthread_t t_PreDemod;
     pthread_t t_Demod;
@@ -47,6 +49,10 @@ public:
     bool isActive();
     void setActive(bool state);
 
+    void squelchAuto();
+    bool isSquelchEnabled();
+    void setSquelchEnabled(bool state);
+
 private:
     std::atomic<std::string *> label;
     bool terminated;
@@ -54,5 +60,6 @@ private:
     bool audioTerminated;
     bool preDemodTerminated;
     std::atomic<bool> active;
+    std::atomic<bool> squelch;
 };
 
diff --git a/src/demod/DemodulatorPreThread.cpp b/src/demod/DemodulatorPreThread.cpp
index b872dc5..19775ec 100644
--- a/src/demod/DemodulatorPreThread.cpp
+++ b/src/demod/DemodulatorPreThread.cpp
@@ -8,9 +8,9 @@
 #include "DemodulatorPreThread.h"
 
 DemodulatorPreThread::DemodulatorPreThread(DemodulatorThreadInputQueue* pQueueIn, DemodulatorThreadPostInputQueue* pQueueOut,
-        DemodulatorThreadCommandQueue* threadQueueNotify) :
+        DemodulatorThreadControlCommandQueue *threadQueueControl, DemodulatorThreadCommandQueue* threadQueueNotify) :
         inputQueue(pQueueIn), postInputQueue(pQueueOut), terminated(false), initialized(false), audio_resampler(NULL), resample_ratio(1), audio_resample_ratio(
-                1), resampler(NULL), commandQueue(NULL), fir_filter(NULL), audioInputQueue(NULL), threadQueueNotify(threadQueueNotify) {
+                1), resampler(NULL), commandQueue(NULL), fir_filter(NULL), audioInputQueue(NULL), threadQueueNotify(threadQueueNotify), threadQueueControl(threadQueueControl) {
 
     float kf = 0.5;         // modulation factor
     fdem = freqdem_create(kf);
@@ -65,9 +65,9 @@ void DemodulatorPreThread::initialize() {
 //    msresamp_crcf_print(resampler);
 
     if (audio_resampler) {
-        msresamp_crcf_destroy(audio_resampler);
+        msresamp_rrrf_destroy(audio_resampler);
     }
-    audio_resampler = msresamp_crcf_create(audio_resample_ratio, As);
+    audio_resampler = msresamp_rrrf_create(audio_resample_ratio, As);
 //    msresamp_crcf_print(audio_resampler);
 
     initialized = true;
diff --git a/src/demod/DemodulatorPreThread.h b/src/demod/DemodulatorPreThread.h
index f11ca03..0295984 100644
--- a/src/demod/DemodulatorPreThread.h
+++ b/src/demod/DemodulatorPreThread.h
@@ -11,7 +11,7 @@ class DemodulatorPreThread {
 public:
 
     DemodulatorPreThread(DemodulatorThreadInputQueue* pQueueIn, DemodulatorThreadPostInputQueue* pQueueOut,
-            DemodulatorThreadCommandQueue* threadQueueNotify);
+            DemodulatorThreadControlCommandQueue *threadQueueControl, DemodulatorThreadCommandQueue* threadQueueNotify);
     ~DemodulatorPreThread();
 
 #ifdef __APPLE__
@@ -28,6 +28,11 @@ public:
         audioInputQueue = tQueue;
     }
 
+    void setDemodulatorControlQueue(DemodulatorThreadControlCommandQueue *tQueue) {
+        threadQueueControl = tQueue;
+    }
+
+
     DemodulatorThreadParameters &getParams() {
         return params;
     }
@@ -52,7 +57,7 @@ protected:
     msresamp_crcf resampler;
     float resample_ratio;
 
-    msresamp_crcf audio_resampler;
+    msresamp_rrrf audio_resampler;
     float audio_resample_ratio;
 
     DemodulatorThreadParameters params;
@@ -71,4 +76,5 @@ protected:
     DemodulatorThreadWorkerCommandQueue *workerQueue;
     DemodulatorThreadWorkerResultQueue *workerResults;
     DemodulatorThreadCommandQueue* threadQueueNotify;
+    DemodulatorThreadControlCommandQueue *threadQueueControl;
 };
diff --git a/src/demod/DemodulatorThread.cpp b/src/demod/DemodulatorThread.cpp
index 2c1e9b4..f9befc5 100644
--- a/src/demod/DemodulatorThread.cpp
+++ b/src/demod/DemodulatorThread.cpp
@@ -6,8 +6,8 @@
 #include <pthread.h>
 #endif
 
-DemodulatorThread::DemodulatorThread(DemodulatorThreadPostInputQueue* pQueue, DemodulatorThreadCommandQueue* threadQueueNotify) :
-        postInputQueue(pQueue), visOutQueue(NULL), terminated(false), audioInputQueue(NULL), threadQueueNotify(threadQueueNotify) {
+DemodulatorThread::DemodulatorThread(DemodulatorThreadPostInputQueue* pQueue, DemodulatorThreadControlCommandQueue *threadQueueControl, DemodulatorThreadCommandQueue* threadQueueNotify) :
+        postInputQueue(pQueue), visOutQueue(NULL), terminated(false), audioInputQueue(NULL), threadQueueNotify(threadQueueNotify), threadQueueControl(threadQueueControl), agc(NULL), squelch_enabled(false), squelch_level(0), squelch_tolerance(0) {
 
     float kf = 0.5;         // modulation factor
     fdem = freqdem_create(kf);
@@ -28,9 +28,12 @@ void DemodulatorThread::threadMain() {
     pthread_setschedparam(tID, SCHED_FIFO, &prio);
 #endif
 
-    msresamp_crcf audio_resampler = NULL;
+    msresamp_rrrf audio_resampler = NULL;
     msresamp_crcf resampler = NULL;
 
+    agc = agc_crcf_create();
+    agc_crcf_set_bandwidth(agc, 1e-3f);
+
     std::cout << "Demodulator thread started.." << std::endl;
     while (!terminated) {
         DemodulatorThreadPostIQData inp;
@@ -47,70 +50,95 @@ void DemodulatorThread::threadMain() {
             audio_resampler = inp.audio_resampler;
         } else if (resampler != inp.resampler) {
             msresamp_crcf_destroy(resampler);
-            msresamp_crcf_destroy(audio_resampler);
+            msresamp_rrrf_destroy(audio_resampler);
             resampler = inp.resampler;
             audio_resampler = inp.audio_resampler;
         }
 
         int out_size = ceil((float) (bufSize) * inp.resample_ratio);
         liquid_float_complex resampled_data[out_size];
+        liquid_float_complex agc_data[out_size];
 
         unsigned int num_written;
         msresamp_crcf_execute(resampler, &inp.data[0], bufSize, resampled_data, &num_written);
 
-        float audio_resample_ratio = inp.audio_resample_ratio;
+        agc_crcf_execute_block(agc, resampled_data, num_written, agc_data);
 
+        float audio_resample_ratio = inp.audio_resample_ratio;
         float demod_output[num_written];
 
-        freqdem_demodulate_block(fdem, resampled_data, num_written, demod_output);
-
-        liquid_float_complex demod_audio_data[num_written];
-
-        for (int i = 0; i < num_written; i++) {
-            demod_audio_data[i].real = demod_output[i];
-            demod_audio_data[i].imag = 0;
-        }
+        freqdem_demodulate_block(fdem, agc_data, num_written, demod_output);
 
         int audio_out_size = ceil((float) (num_written) * audio_resample_ratio);
-        liquid_float_complex resampled_audio_output[audio_out_size];
+        float resampled_audio_output[audio_out_size];
 
         unsigned int num_audio_written;
-        msresamp_crcf_execute(audio_resampler, demod_audio_data, num_written, resampled_audio_output, &num_audio_written);
-
-        std::vector<float> newBuffer;
-        newBuffer.resize(num_audio_written * 2);
-        for (int i = 0; i < num_audio_written; i++) {
-            liquid_float_complex y = resampled_audio_output[i];
-
-            newBuffer[i * 2] = y.real;
-            newBuffer[i * 2 + 1] = y.real;
-        }
+        msresamp_rrrf_execute(audio_resampler, demod_output, num_written, resampled_audio_output, &num_audio_written);
 
         AudioThreadInput ati;
-        ati.data = newBuffer;
+        ati.channels = 1;
+        ati.data.assign(resampled_audio_output,resampled_audio_output+num_audio_written);
 
         if (audioInputQueue != NULL) {
-            audioInputQueue->push(ati);
+            if (!squelch_enabled || ((agc_crcf_get_signal_level(agc)) >= 0.1)) {
+                audioInputQueue->push(ati);
+            }
         }
 
         if (visOutQueue != NULL && visOutQueue->empty()) {
+            AudioThreadInput ati_vis;
+            ati_vis.channels = ati.channels;
+
+            int num_vis = DEMOD_VIS_SIZE;
             if (num_audio_written > num_written) {
-                visOutQueue->push(ati);
+                if (num_vis > num_audio_written) {
+                    num_vis = num_audio_written;
+                }
+                ati_vis.data.assign(ati.data.begin(), ati.data.begin()+num_vis);
             } else {
-                AudioThreadInput ati_vis;
-                ati_vis.data.assign(demod_output, demod_output + num_written);
-                visOutQueue->push(ati_vis);
+                if (num_vis > num_written) {
+                    num_vis = num_written;
+                }
+                ati_vis.data.assign(demod_output, demod_output + num_vis);
+            }
+
+            visOutQueue->push(ati_vis);
+//            std::cout << "Signal: " << agc_crcf_get_signal_level(agc) << " -- " << agc_crcf_get_rssi(agc) << "dB " << std::endl;
+        }
+
+        if (!threadQueueControl->empty()) {
+            while (!threadQueueControl->empty()) {
+                DemodulatorThreadControlCommand command;
+                threadQueueControl->pop(command);
+
+                switch (command.cmd) {
+                case DemodulatorThreadControlCommand::DEMOD_THREAD_CMD_CTL_SQUELCH_AUTO:
+                    squelch_level = agc_crcf_get_signal_level(agc);
+                    squelch_tolerance = agc_crcf_get_signal_level(agc)/2.0;
+                    squelch_enabled = true;
+                    break;
+                case DemodulatorThreadControlCommand::DEMOD_THREAD_CMD_CTL_SQUELCH_OFF:
+                    squelch_level = 0;
+                    squelch_tolerance = 1;
+                    squelch_enabled = false;
+                    break;
+                default:
+                    break;
+                }
             }
         }
+
     }
 
     if (resampler != NULL) {
         msresamp_crcf_destroy(resampler);
     }
     if (audio_resampler != NULL) {
-        msresamp_crcf_destroy(audio_resampler);
+        msresamp_rrrf_destroy(audio_resampler);
     }
 
+    agc_crcf_destroy(agc);
+
     std::cout << "Demodulator thread done." << std::endl;
     DemodulatorThreadCommand tCmd(DemodulatorThreadCommand::DEMOD_THREAD_CMD_DEMOD_TERMINATED);
     tCmd.context = this;
diff --git a/src/demod/DemodulatorThread.h b/src/demod/DemodulatorThread.h
index 2a126a3..5327620 100644
--- a/src/demod/DemodulatorThread.h
+++ b/src/demod/DemodulatorThread.h
@@ -8,10 +8,12 @@
 
 typedef ThreadQueue<AudioThreadInput> DemodulatorThreadOutputQueue;
 
+#define DEMOD_VIS_SIZE 2048
+
 class DemodulatorThread {
 public:
 
-    DemodulatorThread(DemodulatorThreadPostInputQueue* pQueueIn, DemodulatorThreadCommandQueue* threadQueueNotify);
+    DemodulatorThread(DemodulatorThreadPostInputQueue* pQueueIn, DemodulatorThreadControlCommandQueue *threadQueueControl, DemodulatorThreadCommandQueue* threadQueueNotify);
     ~DemodulatorThread();
 
 #ifdef __APPLE__
@@ -44,8 +46,13 @@ protected:
     AudioThreadInputQueue *audioInputQueue;
 
     freqdem fdem;
+    agc_crcf agc;
 
     std::atomic<bool> terminated;
 
     DemodulatorThreadCommandQueue* threadQueueNotify;
+    DemodulatorThreadControlCommandQueue *threadQueueControl;
+    float squelch_level;
+    float squelch_tolerance;
+    bool squelch_enabled;
 };
diff --git a/src/demod/DemodulatorWorkerThread.cpp b/src/demod/DemodulatorWorkerThread.cpp
index f002737..8cadf90 100644
--- a/src/demod/DemodulatorWorkerThread.cpp
+++ b/src/demod/DemodulatorWorkerThread.cpp
@@ -58,7 +58,7 @@ void DemodulatorWorkerThread::threadMain() {
 
             result.fir_filter = firfilt_crcf_create(h, h_len);
             result.resampler = msresamp_crcf_create(result.resample_ratio, As);
-            result.audio_resampler = msresamp_crcf_create(result.audio_resample_ratio, As);
+            result.audio_resampler = msresamp_rrrf_create(result.audio_resample_ratio, As);
 
             result.audioSampleRate = filterCommand.audioSampleRate;
             result.bandwidth = filterCommand.bandwidth;
diff --git a/src/demod/DemodulatorWorkerThread.h b/src/demod/DemodulatorWorkerThread.h
index 9911972..950b5f1 100644
--- a/src/demod/DemodulatorWorkerThread.h
+++ b/src/demod/DemodulatorWorkerThread.h
@@ -36,7 +36,7 @@ public:
     firfilt_crcf fir_filter;
     msresamp_crcf resampler;
     float resample_ratio;
-    msresamp_crcf audio_resampler;
+    msresamp_rrrf audio_resampler;
     float audio_resample_ratio;
 
     unsigned int inputRate;
diff --git a/src/visual/WaterfallCanvas.cpp b/src/visual/WaterfallCanvas.cpp
index d493029..6318996 100644
--- a/src/visual/WaterfallCanvas.cpp
+++ b/src/visual/WaterfallCanvas.cpp
@@ -181,7 +181,16 @@ void WaterfallCanvas::OnKeyDown(wxKeyEvent& event) {
         wxGetApp().removeDemodulator(activeDemod);
         wxGetApp().getDemodMgr().deleteThread(activeDemod);
         break;
-
+    case 'S':
+        if (!activeDemod) {
+            break;
+        }
+        if (activeDemod->isSquelchEnabled()) {
+            activeDemod->setSquelchEnabled(false);
+        } else {
+            activeDemod->squelchAuto();
+        }
+        break;
     default:
         event.Skip();
         return;