diff --git a/Audio/soundin.cpp b/Audio/soundin.cpp
index 581f1a92f..53a29799c 100644
--- a/Audio/soundin.cpp
+++ b/Audio/soundin.cpp
@@ -88,17 +88,16 @@ void SoundInput::start(QAudioDeviceInfo const& device, int framesPerBuffer, Audi
   //qDebug () << "SoundIn default buffer size (bytes):" << m_stream->bufferSize () << "period size:" << m_stream->periodSize ();
   // the Windows MME version of QAudioInput uses 1/5 of the buffer
   // size for period size other platforms seem to optimize themselves
-#if defined (Q_OS_WIN)
-  m_stream->setBufferSize (m_stream->format ().bytesForFrames (framesPerBuffer * 5));
-#else
-  Q_UNUSED (framesPerBuffer);
-#endif
+  if (framesPerBuffer > 0)
+    {
+      m_stream->setBufferSize (m_stream->format ().bytesForFrames (framesPerBuffer));
+    }
   if (m_sink->initialize (QIODevice::WriteOnly, channel))
     {
       m_stream->start (sink);
       checkStream ();
       cummulative_lost_usec_ = -1;
-      //qDebug () << "SoundIn selected buffer size (bytes):" << m_stream->bufferSize () << "peirod size:" << m_stream->periodSize ();
+      LOG_DEBUG ("Selected buffer size (bytes): " << m_stream->bufferSize () << " period size: " << m_stream->periodSize ());
     }
   else
     {
diff --git a/Audio/soundout.cpp b/Audio/soundout.cpp
index 7f38447ac..f3ec3dce3 100644
--- a/Audio/soundout.cpp
+++ b/Audio/soundout.cpp
@@ -111,7 +111,7 @@ void SoundOutput::restart (QIODevice * source)
     }
   m_stream->setCategory ("production");
   m_stream->start (source);
-  LOG_INFO ("Selected buffer size (bytes): " << m_stream->bufferSize () << " period size: " << m_stream->periodSize ());
+  LOG_DEBUG ("Selected buffer size (bytes): " << m_stream->bufferSize () << " period size: " << m_stream->periodSize ());
 }
 
 void SoundOutput::suspend ()
diff --git a/widgets/mainwindow.cpp b/widgets/mainwindow.cpp
index 8ce3e29cb..a24065d60 100644
--- a/widgets/mainwindow.cpp
+++ b/widgets/mainwindow.cpp
@@ -211,7 +211,7 @@ namespace
   QRegularExpression grid_regexp {"\\A(?![Rr]{2}73)[A-Ra-r]{2}[0-9]{2}([A-Xa-x]{2}){0,1}\\z"};
   auto quint32_max = std::numeric_limits<quint32>::max ();
   constexpr int N_WIDGETS {36};
-  constexpr int rx_chunk_size {3456}; // audio samples at 12000 Hz
+  constexpr int default_rx_audio_buffer_frames {-1}; // lets Qt decide
   constexpr int default_tx_audio_buffer_frames {-1}; // lets Qt decide
 
   bool message_is_73 (int type, QStringList const& msg_parts)
@@ -265,6 +265,7 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
   m_soundInput {new SoundInput},
   m_modulator {new Modulator {TX_SAMPLE_RATE, NTMAX}},
   m_soundOutput {new SoundOutput},
+  m_rx_audio_buffer_frames {0},
   m_tx_audio_buffer_frames {0},
   m_msErase {0},
   m_secBandChanged {0},
@@ -457,7 +458,9 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
   m_soundInput->moveToThread (&m_audioThread);
   m_detector->moveToThread (&m_audioThread);
   bool ok;
-  auto buffer_size = env.value ("WSJT_TX_AUDIO_BUFFER_FRAMES", "0").toInt (&ok);
+  auto buffer_size = env.value ("WSJT_RX_AUDIO_BUFFER_FRAMES", "0").toInt (&ok);
+  m_rx_audio_buffer_frames = ok && buffer_size ? buffer_size : default_rx_audio_buffer_frames;
+  buffer_size = env.value ("WSJT_TX_AUDIO_BUFFER_FRAMES", "0").toInt (&ok);
   m_tx_audio_buffer_frames = ok && buffer_size ? buffer_size : default_tx_audio_buffer_frames;
 
   // hook up sound output stream slots & signals and disposal
@@ -939,7 +942,7 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
   if (!m_config.audio_input_device ().isNull ())
     {
       Q_EMIT startAudioInputStream (m_config.audio_input_device ()
-                                    , rx_chunk_size * m_downSampleFactor
+                                    , m_rx_audio_buffer_frames
                                     , m_detector, m_downSampleFactor, m_config.audio_input_channel ());
     }
   if (!m_config.audio_output_device ().isNull ())
@@ -1851,7 +1854,7 @@ void MainWindow::on_actionSettings_triggered()               //Setup Dialog
 
     if(m_config.restart_audio_input () && !m_config.audio_input_device ().isNull ()) {
       Q_EMIT startAudioInputStream (m_config.audio_input_device ()
-                                    , rx_chunk_size * m_downSampleFactor
+                                    , m_rx_audio_buffer_frames
                                     , m_detector, m_downSampleFactor
                                     , m_config.audio_input_channel ());
     }
diff --git a/widgets/mainwindow.h b/widgets/mainwindow.h
index 878e9c6c3..7dfbf8a7e 100644
--- a/widgets/mainwindow.h
+++ b/widgets/mainwindow.h
@@ -404,6 +404,7 @@ private:
   SoundInput * m_soundInput;
   Modulator * m_modulator;
   SoundOutput * m_soundOutput;
+  int m_rx_audio_buffer_frames;
   int m_tx_audio_buffer_frames;
   QThread m_audioThread;