diff --git a/debian/changelog b/debian/changelog
index 87b430006..78fb4e777 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
 sdrangel (3.5.5-1) unstable; urgency=medium
 
-  * Output plugins: use fixed time length for sample FIFO
+  * Output plugins: use fixed time length for sample FIFO of ~0.25s
+  * Audio modulators: reduce audio input file buffer to 0.1s
 
  -- Edouard Griffiths, F4EXB <f4exb06@gmail.com>  Sun, 13 Aug 2017 23:14:18 +0200
 
diff --git a/plugins/channeltx/modam/ammod.cpp b/plugins/channeltx/modam/ammod.cpp
index 01f276250..730791de7 100644
--- a/plugins/channeltx/modam/ammod.cpp
+++ b/plugins/channeltx/modam/ammod.cpp
@@ -38,7 +38,7 @@ const int AMMod::m_levelNbSamples = 480; // every 10ms
 AMMod::AMMod() :
     m_movingAverage(40, 0),
     m_volumeAGC(40, 0),
-    m_audioFifo(4, 48000),
+    m_audioFifo(4, 4800),
 	m_settingsMutex(QMutex::Recursive),
 	m_fileSize(0),
 	m_recordLength(0),
diff --git a/plugins/channeltx/modnfm/nfmmod.cpp b/plugins/channeltx/modnfm/nfmmod.cpp
index 1a7b8c520..bb8ff9d2e 100644
--- a/plugins/channeltx/modnfm/nfmmod.cpp
+++ b/plugins/channeltx/modnfm/nfmmod.cpp
@@ -39,7 +39,7 @@ NFMMod::NFMMod() :
 	m_modPhasor(0.0f),
     m_movingAverage(40, 0),
     m_volumeAGC(40, 0),
-    m_audioFifo(4, 48000),
+    m_audioFifo(4, 4800),
 	m_settingsMutex(QMutex::Recursive),
 	m_fileSize(0),
 	m_recordLength(0),
diff --git a/plugins/channeltx/modssb/ssbmod.cpp b/plugins/channeltx/modssb/ssbmod.cpp
index 1f195cfe2..61b9b80b7 100644
--- a/plugins/channeltx/modssb/ssbmod.cpp
+++ b/plugins/channeltx/modssb/ssbmod.cpp
@@ -46,7 +46,7 @@ SSBMod::SSBMod(BasebandSampleSink* sampleSink) :
 	m_DSBFilterBufferIndex(0),
     m_sampleSink(sampleSink),
     m_movingAverage(40, 0),
-    m_audioFifo(4, 48000),
+    m_audioFifo(4, 4800),
 	m_settingsMutex(QMutex::Recursive),
 	m_fileSize(0),
 	m_recordLength(0),
diff --git a/plugins/channeltx/modwfm/wfmmod.cpp b/plugins/channeltx/modwfm/wfmmod.cpp
index 7a9cdc28a..62e4fcf8b 100644
--- a/plugins/channeltx/modwfm/wfmmod.cpp
+++ b/plugins/channeltx/modwfm/wfmmod.cpp
@@ -40,7 +40,7 @@ WFMMod::WFMMod() :
 	m_modPhasor(0.0f),
     m_movingAverage(40, 0),
     m_volumeAGC(40, 0),
-    m_audioFifo(4, 48000),
+    m_audioFifo(4, 4800),
 	m_settingsMutex(QMutex::Recursive),
     m_fileSize(0),
 	m_recordLength(0),