OnAudioFilterRead is called everytime a chunk of audio is routed through the filter (this happens frequently, every ~20ms depending on the samplerate and platform). The audio data is an array of floats ranging from [-1.0f;1.0f] and contains audio from the previous filter in the chain or the AudioClip on the AudioSource. If this is the first filter in the chain and a clip isn't attached to the audio source this filter will be 'played'. That way you can use the filter as the audio clip, procedurally generating audio.

"A class project in Navigation, Game features Audio only gameplay, to simulate being blind and is set in a Monty Python-ish comical world where a group of blind Monks are initiating you into their society by having you perform several audio navigatory task to help you learn to SEE with your EARS. Game Plays through in about half an hour. "

"Porn for the Blind is a not-for-profit organization dedicated to producing audio descriptions of sample movie clips from adult web sites." :p

provides music discovery and identification solutions, (...) enable companies to provide high quality music recommendations and empower music fans to easily explore and delight in new listening experiences.

a collection of anonymous recordings found at thrift stores, yard sales, and in trash bins over the past four years.

with Instant Sound

field recording radio/podcast

Open Source Jukebox Firmware -> for portable MP3 players

Indecent Phonograph Recordings from the 1890s

discover the original tracks sampled by other artists

"background sounds for small businesses"

flight404's magnetosphere coming to iTunes !

A MBROLA-based real-time voice synthetizer for Max/MSP

universal ASIO driver for WDM audio (including AC97 craps)

In The Pit is an "audio-only" stealth action game, in which you play a nasty creature living at the bottom of a pit, hunting down people who fall in. The "audio-only" part means that there are absolutely no graphics at all.

Bush impersonator reads speeches written by little kids

emulators for Max/MSP+Jitter (atari,intellivision and more to come)

P2P Multi-User Software Synthesizer ?

del.icio.us REALTIME

q3apd uses activity in QuakeIII as control data for the realtime audio synthesis environment Pure Data.

like flickr or youtube, but audio

a collaborative platform that aims to build sound sculptures / music with a limited and imposed sounds library