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+PortAudio is a free, cross platform, open-source, audio I/O library. It
+lets you write simple audio programs in 'C' that will compile and run on
+many platforms including Windows, Macintosh (8,9,X), Unix (OSS), SGI, and
+BeOS. PortAudio is intended to promote the exchange of audio synthesis
+software between developers on different platforms, and was recently
+selected as the audio component of a larger PortMusic project that includes
+MIDI and sound file support.
+
+PortAudio provides a very simple API for recording and/or playing sound
+using a simple callback function. Example programs are included that
+synthesize sine waves and pink noise, perform fuzz distortion on a guitar,
+list available audio devices, etc.