Now that you have a good idea of how PortAudio works, you can try out the example programs. You'll find them in the examples/ directory in the PortAudio distribution.

For an example of playing a sine wave, see examples/paex_sine.c.

For an example of recording and playing back a sound, see examples/paex_record.c.

I also encourage you to examine the source for the PortAudio libraries. If you have suggestions on ways to improve them, please let us know. If you want to implement PortAudio on a new platform, please let us know as well so we can coordinate people's efforts.

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