diff --git a/configure.ac b/configure.ac
index 2da42ec..de85421 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,7 +8,7 @@ AC_CONFIG_FILES(src/Makefile projects/demo/Makefile projects/effects/Makefile pr
 AC_SUBST( GXX, ["no"] )
 
 # Checks for programs.
-AC_PROG_CXX
+AC_PROG_CXX(g++ CC c++ cxx)
 AC_PROG_RANLIB
 AC_PATH_PROG(AR, ar, no)
 if [[ $AR = "no" ]] ; then
diff --git a/doc/ReleaseNotes.txt b/doc/ReleaseNotes.txt
index b658a0c..f8ce588 100644
--- a/doc/ReleaseNotes.txt
+++ b/doc/ReleaseNotes.txt
@@ -2,6 +2,12 @@ The Synthesis ToolKit in C++ (STK)
 
 By Perry R. Cook and Gary P. Scavone, 1995-2009.
 
+v4.4.1: (3 June 2009)
+- added multi-channel/frame tick() virtual function to WvIn and WvOut abstract base classes (required update to RtWvOut class)
+- updated configure script to select g++ compiler by default
+- in demo.cpp: removed voicer grouping for messages, fixing polyphony when messages are on the same MIDI/SKINI channel
+- updates to RtAudio and RtMidi
+
 v4.4: (30 April 2009)
 - all classes embedded in the "stk" namespace (except RtAudio, RtMidi, and RtError)
 - class WaveLoop renamed FileLoop
diff --git a/doc/doxygen/Doxyfile b/doc/doxygen/Doxyfile
index 4075272..47fbc0a 100644
--- a/doc/doxygen/Doxyfile
+++ b/doc/doxygen/Doxyfile
@@ -31,7 +31,7 @@ PROJECT_NAME           = STK
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER         = 4.4.0
+PROJECT_NUMBER         = 4.4.1
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
 # base path where the generated documentation will be put. 
diff --git a/doc/doxygen/download.txt b/doc/doxygen/download.txt
index d15e6c6..55a67dd 100644
--- a/doc/doxygen/download.txt
+++ b/doc/doxygen/download.txt
@@ -1,14 +1,23 @@
 /*! \page download Download, Release Notes, and Bug Fixes
 
-\section down Download Version 4.4.0 (30 April 2009):
+\section down Download Version 4.4.1 (3 June 2009):
 
 <UL>
-<LI><A HREF="http://ccrma.stanford.edu/software/stk/release/stk-4.4.0.tar.gz">Source distribution</A></LI>
+<LI><A HREF="http://ccrma.stanford.edu/software/stk/release/stk-4.4.1.tar.gz">Source distribution</A></LI>
 </UL>
 
 
 \section notes Release Notes:
 
+\subsection v4dot4dot1 Version 4.4.1
+
+<ul>
+<li>Added multi-channel/frame tick() virtual function to WvIn and WvOut abstract base classes (required update to RtWvOut class).</li>
+<li>Updated configure script to select g++ compiler by default.</li>
+<li>In demo.cpp: removed voicer grouping for messages, fixing polyphony when messages are on the same MIDI/SKINI channel.</li>
+<li>Updates to RtAudio and RtMidi.</li>
+</ul>
+
 \subsection v4dot4dot0 Version 4.4.0
 
 <ul>
diff --git a/doc/hierarchy.txt b/doc/hierarchy.txt
index b766194..9e760ef 100644
--- a/doc/hierarchy.txt
+++ b/doc/hierarchy.txt
@@ -1,6 +1,6 @@
 STK: A ToolKit of Audio Synthesis Classes and Instruments in C++
 
-By Perry R. Cook and Gary P. Scavone, 1995-2007.
+By Perry R. Cook and Gary P. Scavone, 1995-2009.
 
 STK Classes - See the HTML documentation in the html directory for complete information.
 
diff --git a/include/RtAudio.h b/include/RtAudio.h
index 5c5fd6f..b9bab05 100644
--- a/include/RtAudio.h
+++ b/include/RtAudio.h
@@ -42,7 +42,7 @@
   \file RtAudio.h
  */
 
-// RtAudio: Version 4.0.5
+// RtAudio: Version 4.0.6
 
 #ifndef __RTAUDIO_H
 #define __RTAUDIO_H
diff --git a/include/RtMidi.h b/include/RtMidi.h
index 2928eaf..eab4626 100644
--- a/include/RtMidi.h
+++ b/include/RtMidi.h
@@ -35,7 +35,7 @@
 */
 /**********************************************************************/
 
-// RtMidi: Version 1.0.9
+// RtMidi: Version 1.0.10
 
 #ifndef RTMIDI_H
 #define RTMIDI_H
diff --git a/include/RtWvOut.h b/include/RtWvOut.h
index fdaa150..8a15f0e 100644
--- a/include/RtWvOut.h
+++ b/include/RtWvOut.h
@@ -73,7 +73,7 @@ class RtWvOut : public WvOut
     checked if _STK_DEBUG_ is defined during compilation, in which
     case an incompatibility will trigger an StkError exception.
   */
-  void tick( StkFrames& frames );
+  void tick( const StkFrames& frames );
 
   // This function is not intended for general use but must be
   // public for access from the audio callback function.
diff --git a/include/WvIn.h b/include/WvIn.h
index 651bbc2..847973c 100644
--- a/include/WvIn.h
+++ b/include/WvIn.h
@@ -31,6 +31,9 @@ public:
   //! Compute one sample frame and return the specified \c channel value.
   virtual StkFloat tick( unsigned int channel = 0 ) = 0;
 
+  //! Fill the StkFrames argument with computed frames and return the same reference.
+  virtual StkFrames& tick( StkFrames& frames ) = 0;
+
 protected:
 
   StkFrames data_;
diff --git a/include/WvOut.h b/include/WvOut.h
index 1339319..ebfd013 100644
--- a/include/WvOut.h
+++ b/include/WvOut.h
@@ -44,6 +44,9 @@ class WvOut : public Stk
   */
   virtual void tick( const StkFloat sample ) = 0;
 
+  //! Output the StkFrames data.
+  virtual void tick( const StkFrames& frames ) = 0;
+
  protected:
 
   // Check for sample clipping and clamp.
diff --git a/projects/demo/demo.cpp b/projects/demo/demo.cpp
index f7bcd63..b7c2b74 100644
--- a/projects/demo/demo.cpp
+++ b/projects/demo/demo.cpp
@@ -69,8 +69,8 @@ void processMessage( TickData* data )
   register StkFloat value2 = data->message.floatValues[1];
 
   // If only one instrument, allow messages from all channels to control it.
-  int channel = 1;
-  if ( data->nVoices > 1 ) channel = data->message.channel;
+  //int group = 1;
+  //  if ( data->nVoices > 1 ) group = data->message.channel;
 
   switch( data->message.type ) {
 
@@ -81,13 +81,13 @@ void processMessage( TickData* data )
 
   case __SK_NoteOn_:
     if ( value2 == 0.0 ) // velocity is zero ... really a NoteOff
-      data->voicer->noteOff( value1, 64.0, channel );
+      data->voicer->noteOff( value1, 64.0 );
     else // a NoteOn
-      data->voicer->noteOn( value1, value2, channel );
+      data->voicer->noteOn( value1, value2 );
     break;
 
   case __SK_NoteOff_:
-    data->voicer->noteOff( value1, value2, channel );
+    data->voicer->noteOff( value1, value2 );
     break;
 
   case __SK_ControlChange_:
@@ -96,34 +96,34 @@ void processMessage( TickData* data )
     else if (value1 == 7.0)
       data->volume = value2 * ONE_OVER_128;
     else if (value1 == 49.0)
-      data->voicer->setFrequency( value2, channel );
+      data->voicer->setFrequency( value2 );
     else if (value1 == 50.0)
-      data->voicer->controlChange( 128, value2, channel );
+      data->voicer->controlChange( 128, value2 );
     else if (value1 == 51.0)
       data->frequency = data->message.intValues[1];
     else if (value1 == 52.0) {
       data->frequency += ( data->message.intValues[1] << 7 );
       // Convert to a fractional MIDI note value
       StkFloat note = 12.0 * log( data->frequency / 220.0 ) / log( 2.0 ) + 57.0;
-      data->voicer->setFrequency( note, channel );
+      data->voicer->setFrequency( note );
     }
     else
-      data->voicer->controlChange( (int) value1, value2, channel );
+      data->voicer->controlChange( (int) value1, value2 );
     break;
 
   case __SK_AfterTouch_:
-    data->voicer->controlChange( 128, value1, channel );
+    data->voicer->controlChange( 128, value1 );
     break;
 
   case __SK_PitchChange_:
-    data->voicer->setFrequency( value1, channel );
+    data->voicer->setFrequency( value1 );
     break;
 
   case __SK_PitchBend_:
     short temp;
     temp = data->message.intValues[1] << 7;
     temp += data->message.intValues[0];
-    data->voicer->pitchBend( (StkFloat) temp, channel );
+    data->voicer->pitchBend( (StkFloat) temp );
     break;
 
   case __SK_Volume_:
@@ -143,7 +143,7 @@ void processMessage( TickData* data )
       data->currentVoice = voiceByNumber( (int)value1, &data->instrument[i] );
       if ( data->currentVoice < 0 )
         data->currentVoice = voiceByNumber( 0, &data->instrument[i] );
-      data->voicer->addInstrument( data->instrument[i], channel );
+      data->voicer->addInstrument( data->instrument[i] );
       data->settling = false;
     }
 
@@ -224,14 +224,14 @@ int main( int argc, char *argv[] )
 
   // Check the command-line arguments for errors and to determine
   // the number of WvOut objects to be instantiated (in utilities.cpp).
-  data.nWvOuts = checkArgs(argc, argv);
-  data.wvout = (WvOut **) calloc(data.nWvOuts, sizeof(WvOut *));
+  data.nWvOuts = checkArgs( argc, argv );
+  data.wvout = (WvOut **) calloc( data.nWvOuts, sizeof(WvOut *) );
 
   // Instantiate the instrument(s) type from the command-line argument
   // (in utilities.cpp).
-  data.nVoices = countVoices(argc, argv);
-  data.instrument = (Instrmnt **) calloc(data.nVoices, sizeof(Instrmnt *));
-  data.currentVoice = voiceByName(argv[1], &data.instrument[0]);
+  data.nVoices = countVoices( argc, argv );
+  data.instrument = (Instrmnt **) calloc( data.nVoices, sizeof(Instrmnt *) );
+  data.currentVoice = voiceByName( argv[1], &data.instrument[0] );
   if ( data.currentVoice < 0 ) {
     free( data.wvout );
     free( data.instrument );
@@ -239,16 +239,16 @@ int main( int argc, char *argv[] )
   }
   // If there was no error allocating the first voice, we should be fine for more.
   for ( i=1; i<data.nVoices; i++ )
-    voiceByName(argv[1], &data.instrument[i]);
+    voiceByName( argv[1], &data.instrument[i] );
 
-  data.voicer = (Voicer *) new Voicer( data.nVoices );
+  data.voicer = (Voicer *) new Voicer( 0.0 );
   for ( i=0; i<data.nVoices; i++ )
-    data.voicer->addInstrument( data.instrument[i], i+1 );
+    data.voicer->addInstrument( data.instrument[i] );
 
   // Parse the command-line flags, instantiate WvOut objects, and
   // instantiate the input message controller (in utilities.cpp).
   try {
-    data.realtime = parseArgs(argc, argv, data.wvout, data.messager);
+    data.realtime = parseArgs( argc, argv, data.wvout, data.messager );
   }
   catch (StkError &) {
     goto cleanup;
diff --git a/projects/examples/test.cpp b/projects/examples/test.cpp
new file mode 100644
index 0000000..fa0d739
--- /dev/null
+++ b/projects/examples/test.cpp
@@ -0,0 +1,56 @@
+// sineosc.cpp STK tutorial program
+
+#include "FileWvIn.h"
+#include "RtWvOut.h"
+using namespace stk;
+
+int main()
+{
+  // Set the global sample rate before creating class instances.
+  Stk::setSampleRate( 44100.0 );
+
+  int nFrames = 100000;
+  WvIn *input;
+  //  FileWvOut output;
+  WvOut *output;
+
+  try {
+    // Load the sine wave file.
+    input = new FileWvIn( "hellosine.wav" );
+
+    // Open a 16-bit, one-channel WAV formatted output file
+    //   output = new FileWvOut( "hellosine.wav", 1, FileWrite::FILE_WAV, Stk::STK_SINT16 );
+    output = new RtWvOut();
+  }
+  catch ( StkError & ) {
+    exit( 1 );
+  }
+
+  //input.setFrequency( 440.0 );
+
+  // Option 1: Use StkFrames
+  /*
+  StkFrames frames( nFrames, 1 );
+  try {
+    output->tick( input->tick( frames ) );
+  }
+  catch ( StkError & ) {
+    exit( 1 );
+  }
+  */
+
+  // Option 2: Single-sample computations
+  for ( int i=0; i<nFrames; i++ ) {
+    try {
+      output->tick( input->tick() );
+    }
+    catch ( StkError & ) {
+      exit( 1 );
+    }
+  }
+
+  delete output;
+  delete input;
+
+  return 0;
+}
diff --git a/src/Granulate.cpp b/src/Granulate.cpp
index eaeac34..482dbdc 100644
--- a/src/Granulate.cpp
+++ b/src/Granulate.cpp
@@ -260,7 +260,7 @@ StkFloat Granulate :: tick( unsigned int channel )
     // Accumulate the grain outputs.
     if ( grains_[i].state > 0 ) {
       for ( j=0; j<nChannels; j++ ) {
-        sample = data_[ nChannels * grains_[i].pointer + j ];        
+        sample = data_[ nChannels * grains_[i].pointer + j ];
 
         if ( grains_[i].state == GRAIN_FADEIN || grains_[i].state == GRAIN_FADEOUT ) {
           sample *= grains_[i].eScaler;
diff --git a/src/RtAudio.cpp b/src/RtAudio.cpp
index cd427f3..8d47585 100644
--- a/src/RtAudio.cpp
+++ b/src/RtAudio.cpp
@@ -38,7 +38,7 @@
 */
 /************************************************************************/
 
-// RtAudio: Version 4.0.5
+// RtAudio: Version 4.0.6
 
 #include "RtAudio.h"
 #include <iostream>
@@ -403,7 +403,9 @@ unsigned int RtApi :: getStreamSampleRate( void )
 // implementation.
 struct CoreHandle {
   AudioDeviceID id[2];    // device ids
+#if defined( MAC_OS_X_VERSION_10_5 ) && ( MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5 )
   AudioDeviceIOProcID procId[2];
+#endif
   UInt32 iStream[2];      // device stream index (or first if using multiple)
   UInt32 nStreams[2];     // number of streams to use
   bool xrun[2];
@@ -5646,7 +5648,7 @@ bool RtApiAlsa :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   }
 
   // Set the buffer number, which in ALSA is referred to as the "period".
-  int totalSize, dir;
+  int totalSize, dir = 0;
   unsigned int periods = 0;
   if ( options ) periods = options->numberOfBuffers;
   totalSize = *bufferSize * periods;
diff --git a/src/RtMidi.cpp b/src/RtMidi.cpp
index 8e05db9..4b73921 100644
--- a/src/RtMidi.cpp
+++ b/src/RtMidi.cpp
@@ -35,7 +35,7 @@
 */
 /**********************************************************************/
 
-// RtMidi: Version 1.0.9
+// RtMidi: Version 1.0.10
 
 #include "RtMidi.h"
 #include <sstream>
@@ -743,7 +743,7 @@ void RtMidiOut :: sendMessage( std::vector<unsigned char> *message )
 
   unsigned int packetBytes, bytesLeft = nBytes;
   unsigned int messageIndex = 0;
-  MIDITimeStamp timeStamp = 0;
+  MIDITimeStamp timeStamp = AudioGetCurrentHostTime();
   CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
 
   while ( bytesLeft > 0 ) {
diff --git a/src/RtWvOut.cpp b/src/RtWvOut.cpp
index d45ecb8..98ee3e5 100644
--- a/src/RtWvOut.cpp
+++ b/src/RtWvOut.cpp
@@ -165,7 +165,7 @@ void RtWvOut :: tick( const StkFloat sample )
     writeIndex_ = 0;
 }
 
-void RtWvOut :: tick( StkFrames& frames )
+void RtWvOut :: tick( const StkFrames& frames )
 {
 #if defined(_STK_DEBUG_)
   if ( data_.channels() != frames.channels() ) {
@@ -195,7 +195,8 @@ void RtWvOut :: tick( StkFrames& frames )
       nFrames = frames.frames() - framesWritten;
     bytes = nFrames * nChannels * sizeof( StkFloat );
     StkFloat *samples = &data_[writeIndex_ * nChannels];
-    memcpy( samples, &frames[framesWritten * nChannels], bytes );
+    StkFrames *ins = (StkFrames *) &frames;
+    memcpy( samples, &(*ins)[framesWritten * nChannels], bytes );
     for ( unsigned int i=0; i<nFrames * nChannels; i++ ) clipTest( *samples++ );
 
     writeIndex_ += nFrames;