diff --git a/include/boo/audiodev/IAudioVoiceEngine.hpp b/include/boo/audiodev/IAudioVoiceEngine.hpp
index 2367b17..1cd9ab7 100644
--- a/include/boo/audiodev/IAudioVoiceEngine.hpp
+++ b/include/boo/audiodev/IAudioVoiceEngine.hpp
@@ -35,6 +35,9 @@ struct IAudioVoiceEngine
     /** Client calls this to allocate a Submix for gathering audio together for effects processing */
     virtual std::unique_ptr<IAudioSubmix> allocateNewSubmix(IAudioSubmixCallback* cb=nullptr)=0;
 
+    /** Client may optionally register a 200-virtual-updates each second callback for the stream */
+    virtual void register5MsCallback(std::function<void(double dt)>&& callback)=0;
+
     /** Client may use this to determine current speaker-setup */
     virtual AudioChannelSet getAvailableSet()=0;
 
diff --git a/lib/audiodev/ALSA.cpp b/lib/audiodev/ALSA.cpp
index 5bb6d5f..6b03b80 100644
--- a/lib/audiodev/ALSA.cpp
+++ b/lib/audiodev/ALSA.cpp
@@ -153,11 +153,13 @@ struct ALSAAudioVoiceEngine : BaseAudioVoiceEngine
         {
             bestRate = 96000;
             m_mixInfo.m_sampleRate = 96000.0;
+            m_5msFrames = 96000 * 5 / 1000;
         }
         else if (!snd_pcm_hw_params_test_rate(m_pcm, hwParams, 48000, 0))
         {
             bestRate = 48000;
             m_mixInfo.m_sampleRate = 48000.0;
+            m_5msFrames = 48000 * 5 / 1000;
         }
         else
         {
diff --git a/lib/audiodev/AudioVoice.cpp b/lib/audiodev/AudioVoice.cpp
index 84839e8..9cc3311 100644
--- a/lib/audiodev/AudioVoice.cpp
+++ b/lib/audiodev/AudioVoice.cpp
@@ -20,7 +20,7 @@ void AudioVoice::_setPitchRatio(double ratio, bool slew)
 {
     if (m_dynamicRate)
     {
-        soxr_error_t err = soxr_set_io_ratio(m_src, ratio * m_sampleRateIn / m_sampleRateOut, slew ? m_5msFrames : 0);
+        soxr_error_t err = soxr_set_io_ratio(m_src, ratio * m_sampleRateIn / m_sampleRateOut, slew ? m_root.m_5msFrames : 0);
         if (err)
         {
             Log.report(logvisor::Fatal, "unable to set resampler rate: %s", soxr_strerror(err));
@@ -99,7 +99,6 @@ void AudioVoiceMono::_resetSampleRate(double sampleRate)
 
     m_sampleRateIn = sampleRate;
     m_sampleRateOut = rateOut;
-    m_5msFrames = rateOut * 5 / 1000;
     soxr_set_input_fn(m_src, soxr_input_fn_t(SRCCallback), this, 0);
     _setPitchRatio(m_pitchRatio, false);
     m_resetSampleRate = false;
@@ -121,21 +120,13 @@ size_t AudioVoiceMono::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
     if (scratch16.size() < frames)
         scratch16.resize(frames);
 
-    size_t oDone;
-    size_t totalDone = 0;
-    while (frames)
-    {
-        oDone = soxr_output(m_src, scratch16.data(), m_5msFrames);
-        _midUpdate();
-        if (oDone)
-        {
-            buf = m_matrix.mixMonoSampleData(mixInfo, scratch16.data(), buf, oDone);
-            totalDone += oDone;
-            frames -= oDone;
-        }
-    }
+    size_t oDone = soxr_output(m_src, scratch16.data(), frames);
+    _midUpdate();
 
-    return totalDone;
+    if (oDone)
+        m_matrix.mixMonoSampleData(mixInfo, scratch16.data(), buf, oDone);
+
+    return oDone;
 }
 
 size_t AudioVoiceMono::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
@@ -145,21 +136,13 @@ size_t AudioVoiceMono::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
     if (scratch32.size() < frames)
         scratch32.resize(frames);
 
-    size_t oDone;
-    size_t totalDone = 0;
-    while (frames)
-    {
-        oDone = soxr_output(m_src, scratch32.data(), m_5msFrames);
-        _midUpdate();
-        if (oDone)
-        {
-            buf = m_matrix.mixMonoSampleData(mixInfo, scratch32.data(), buf, oDone);
-            totalDone += oDone;
-            frames -= oDone;
-        }
-    }
+    size_t oDone = soxr_output(m_src, scratch32.data(), frames);
+    _midUpdate();
 
-    return totalDone;
+    if (oDone)
+        m_matrix.mixMonoSampleData(mixInfo, scratch32.data(), buf, oDone);
+
+    return oDone;
 }
 
 size_t AudioVoiceMono::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
@@ -169,21 +152,13 @@ size_t AudioVoiceMono::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
     if (scratchFlt.size() < frames)
         scratchFlt.resize(frames);
 
-    size_t oDone;
-    size_t totalDone = 0;
-    while (frames)
-    {
-        oDone = soxr_output(m_src, scratchFlt.data(), m_5msFrames);
-        _midUpdate();
-        if (oDone)
-        {
-            buf = m_matrix.mixMonoSampleData(mixInfo, scratchFlt.data(), buf, oDone);
-            totalDone += oDone;
-            frames -= oDone;
-        }
-    }
+    size_t oDone = soxr_output(m_src, scratchFlt.data(), frames);
+    _midUpdate();
 
-    return totalDone;
+    if (oDone)
+        m_matrix.mixMonoSampleData(mixInfo, scratchFlt.data(), buf, oDone);
+
+    return oDone;
 }
 
 void AudioVoiceMono::setDefaultMatrixCoefficients()
@@ -263,21 +238,13 @@ size_t AudioVoiceStereo::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
     if (scratch16.size() < samples)
         scratch16.resize(samples);
 
-    size_t oDone;
-    size_t totalDone = 0;
-    while (frames)
-    {
-        oDone = soxr_output(m_src, scratch16.data(), m_5msFrames);
-        _midUpdate();
-        if (oDone)
-        {
-            buf = m_matrix.mixStereoSampleData(mixInfo, scratch16.data(), buf, oDone);
-            totalDone += oDone;
-            frames -= oDone;
-        }
-    }
+    size_t oDone = soxr_output(m_src, scratch16.data(), frames);
+    _midUpdate();
 
-    return totalDone;
+    if (oDone)
+        m_matrix.mixStereoSampleData(mixInfo, scratch16.data(), buf, oDone);
+
+    return oDone;
 }
 
 size_t AudioVoiceStereo::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
@@ -288,21 +255,13 @@ size_t AudioVoiceStereo::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
     if (scratch32.size() < samples)
         scratch32.resize(samples);
 
-    size_t oDone;
-    size_t totalDone = 0;
-    while (frames)
-    {
-        oDone = soxr_output(m_src, scratch32.data(), m_5msFrames);
-        _midUpdate();
-        if (oDone)
-        {
-            buf = m_matrix.mixStereoSampleData(mixInfo, scratch32.data(), buf, oDone);
-            totalDone += oDone;
-            frames -= oDone;
-        }
-    }
+    size_t oDone = soxr_output(m_src, scratch32.data(), frames);
+    _midUpdate();
 
-    return totalDone;
+    if (oDone)
+        m_matrix.mixStereoSampleData(mixInfo, scratch32.data(), buf, oDone);
+
+    return oDone;
 }
 
 size_t AudioVoiceStereo::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
@@ -313,21 +272,13 @@ size_t AudioVoiceStereo::pumpAndMix(const AudioVoiceEngineMixInfo& mixInfo,
     if (scratchFlt.size() < samples)
         scratchFlt.resize(samples);
 
-    size_t oDone;
-    size_t totalDone = 0;
-    while (frames)
-    {
-        oDone = soxr_output(m_src, scratchFlt.data(), m_5msFrames);
-        _midUpdate();
-        if (oDone)
-        {
-            buf = m_matrix.mixStereoSampleData(mixInfo, scratchFlt.data(), buf, oDone);
-            totalDone += oDone;
-            frames -= oDone;
-        }
-    }
+    size_t oDone = soxr_output(m_src, scratchFlt.data(), frames);
+    _midUpdate();
 
-    return totalDone;
+    if (oDone)
+        m_matrix.mixStereoSampleData(mixInfo, scratchFlt.data(), buf, oDone);
+
+    return oDone;
 }
 
 void AudioVoiceStereo::setDefaultMatrixCoefficients()
diff --git a/lib/audiodev/AudioVoice.hpp b/lib/audiodev/AudioVoice.hpp
index 344c7ee..5e62cb6 100644
--- a/lib/audiodev/AudioVoice.hpp
+++ b/lib/audiodev/AudioVoice.hpp
@@ -36,7 +36,6 @@ protected:
     soxr_t m_src = nullptr;
     double m_sampleRateIn;
     double m_sampleRateOut;
-    size_t m_5msFrames;
     bool m_dynamicRate;
 
     /* Running bool */
diff --git a/lib/audiodev/AudioVoiceEngine.cpp b/lib/audiodev/AudioVoiceEngine.cpp
index e5482c9..5b1d6ca 100644
--- a/lib/audiodev/AudioVoiceEngine.cpp
+++ b/lib/audiodev/AudioVoiceEngine.cpp
@@ -15,31 +15,94 @@ BaseAudioVoiceEngine::~BaseAudioVoiceEngine()
 void BaseAudioVoiceEngine::_pumpAndMixVoices(size_t frames, int16_t* dataOut)
 {
     memset(dataOut, 0, sizeof(int16_t) * frames * m_mixInfo.m_channelMap.m_channelCount);
-    for (AudioVoice* vox : m_activeVoices)
-        if (vox->m_running)
-            vox->pumpAndMix(m_mixInfo, frames, dataOut);
-    for (AudioSubmix* smx : m_activeSubmixes)
-        smx->_pumpAndMixVoices(frames, dataOut);
+
+    size_t remFrames = frames;
+    while (remFrames)
+    {
+        size_t thisFrames;
+        if (remFrames < m_5msFrames)
+        {
+            thisFrames = remFrames;
+            if (m_5msCallback)
+                m_5msCallback(thisFrames / double(m_5msFrames) * 5.0 / 1000.0);
+        }
+        else
+        {
+            thisFrames = m_5msFrames;
+            if (m_5msCallback)
+                m_5msCallback(5.0 / 1000.0);
+        }
+
+        for (AudioVoice* vox : m_activeVoices)
+            if (vox->m_running)
+                vox->pumpAndMix(m_mixInfo, thisFrames, dataOut);
+        for (AudioSubmix* smx : m_activeSubmixes)
+            smx->_pumpAndMixVoices(thisFrames, dataOut);
+        remFrames -= thisFrames;
+        dataOut += thisFrames * m_mixInfo.m_channelMap.m_channelCount;
+    }
 }
 
 void BaseAudioVoiceEngine::_pumpAndMixVoices(size_t frames, int32_t* dataOut)
 {
     memset(dataOut, 0, sizeof(int32_t) * frames * m_mixInfo.m_channelMap.m_channelCount);
-    for (AudioVoice* vox : m_activeVoices)
-        if (vox->m_running)
-            vox->pumpAndMix(m_mixInfo, frames, dataOut);
-    for (AudioSubmix* smx : m_activeSubmixes)
-        smx->_pumpAndMixVoices(frames, dataOut);
+
+    size_t remFrames = frames;
+    while (remFrames)
+    {
+        size_t thisFrames;
+        if (remFrames < m_5msFrames)
+        {
+            thisFrames = remFrames;
+            if (m_5msCallback)
+                m_5msCallback(thisFrames / double(m_5msFrames) * 5.0 / 1000.0);
+        }
+        else
+        {
+            thisFrames = m_5msFrames;
+            if (m_5msCallback)
+                m_5msCallback(5.0 / 1000.0);
+        }
+
+        for (AudioVoice* vox : m_activeVoices)
+            if (vox->m_running)
+                vox->pumpAndMix(m_mixInfo, thisFrames, dataOut);
+        for (AudioSubmix* smx : m_activeSubmixes)
+            smx->_pumpAndMixVoices(thisFrames, dataOut);
+        remFrames -= thisFrames;
+        dataOut += thisFrames * m_mixInfo.m_channelMap.m_channelCount;
+    }
 }
 
 void BaseAudioVoiceEngine::_pumpAndMixVoices(size_t frames, float* dataOut)
 {
     memset(dataOut, 0, sizeof(float) * frames * m_mixInfo.m_channelMap.m_channelCount);
-    for (AudioVoice* vox : m_activeVoices)
-        if (vox->m_running)
-            vox->pumpAndMix(m_mixInfo, frames, dataOut);
-    for (AudioSubmix* smx : m_activeSubmixes)
-        smx->_pumpAndMixVoices(frames, dataOut);
+
+    size_t remFrames = frames;
+    while (remFrames)
+    {
+        size_t thisFrames;
+        if (remFrames < m_5msFrames)
+        {
+            thisFrames = remFrames;
+            if (m_5msCallback)
+                m_5msCallback(thisFrames / double(m_5msFrames) * 5.0 / 1000.0);
+        }
+        else
+        {
+            thisFrames = m_5msFrames;
+            if (m_5msCallback)
+                m_5msCallback(5.0 / 1000.0);
+        }
+
+        for (AudioVoice* vox : m_activeVoices)
+            if (vox->m_running)
+                vox->pumpAndMix(m_mixInfo, thisFrames, dataOut);
+        for (AudioSubmix* smx : m_activeSubmixes)
+            smx->_pumpAndMixVoices(thisFrames, dataOut);
+        remFrames -= thisFrames;
+        dataOut += thisFrames * m_mixInfo.m_channelMap.m_channelCount;
+    }
 }
 
 void BaseAudioVoiceEngine::_unbindFrom(std::list<AudioVoice*>::iterator it)
@@ -86,6 +149,11 @@ BaseAudioVoiceEngine::allocateNewSubmix(IAudioSubmixCallback* cb)
     return ret;
 }
 
+void BaseAudioVoiceEngine::register5MsCallback(std::function<void(double dt)>&& callback)
+{
+    m_5msCallback = std::move(callback);
+}
+
 const AudioVoiceEngineMixInfo& BaseAudioVoiceEngine::mixInfo() const
 {
     return m_mixInfo;
diff --git a/lib/audiodev/AudioVoiceEngine.hpp b/lib/audiodev/AudioVoiceEngine.hpp
index e29b9e7..f5f3d11 100644
--- a/lib/audiodev/AudioVoiceEngine.hpp
+++ b/lib/audiodev/AudioVoiceEngine.hpp
@@ -5,6 +5,7 @@
 #include "AudioVoice.hpp"
 #include "AudioSubmix.hpp"
 #include "IAudioMix.hpp"
+#include <functional>
 
 namespace boo
 {
@@ -31,6 +32,8 @@ protected:
     AudioVoiceEngineMixInfo m_mixInfo;
     std::list<AudioVoice*> m_activeVoices;
     std::list<AudioSubmix*> m_activeSubmixes;
+    size_t m_5msFrames = 0;
+    std::function<void(double dt)> m_5msCallback;
 
     /* Shared scratch buffers for accumulating audio data for resampling */
     std::vector<int16_t> m_scratchIn;
@@ -57,6 +60,8 @@ public:
 
     std::unique_ptr<IAudioSubmix> allocateNewSubmix(IAudioSubmixCallback* cb);
 
+    void register5MsCallback(std::function<void(double dt)>&& callback);
+
     const AudioVoiceEngineMixInfo& mixInfo() const;
     AudioChannelSet getAvailableSet() {return m_mixInfo.m_channels;}
     void pumpAndMixVoices() {}