Introduction - If you have any usage issues, please Google them yourself
PortAudio is a free, cross-platform, open-source, audio I/O library. It lets you write simple audio programs in C or C++ that will compile and run on many platforms including Windows, Macintosh OS X, and Unix (OSS/ALSA). It is intended to promote the exchange of audio software between developers on different platforms. Many applications use PortAudio for Audio I/O.