diff --git a/sdrbase/dsp/dspengine.cpp b/sdrbase/dsp/dspengine.cpp
index 524b57c4e..3286235b5 100644
--- a/sdrbase/dsp/dspengine.cpp
+++ b/sdrbase/dsp/dspengine.cpp
@@ -102,17 +102,6 @@ void DSPEngine::stopAudioOutput()
     m_audioOutput.stop();
 }
 
-void DSPEngine::startAudioOutputImmediate()
-{
-    m_audioOutput.startImmediate(m_audioOutputDeviceIndex, m_audioOutputSampleRate);
-    m_audioOutputSampleRate = m_audioOutput.getRate(); // update with actual rate
-}
-
-void DSPEngine::stopAudioOutputImmediate()
-{
-    m_audioOutput.stopImmediate();
-}
-
 void DSPEngine::startAudioInput()
 {
     m_audioInput.start(m_audioInputDeviceIndex, m_audioInputSampleRate);
diff --git a/sdrbase/dsp/dspengine.h b/sdrbase/dsp/dspengine.h
index 273ff693e..31ff1fff0 100644
--- a/sdrbase/dsp/dspengine.h
+++ b/sdrbase/dsp/dspengine.h
@@ -52,8 +52,6 @@ public:
 	AudioDeviceManager *getAudioDeviceManager() { return &m_audioDeviceManager; }
 	void startAudioOutput();
 	void stopAudioOutput();
-    void startAudioOutputImmediate();
-    void stopAudioOutputImmediate();
     void setAudioOutputDeviceIndex(int index) { m_audioOutputDeviceIndex = index; }
 
     void startAudioInput();