SuperCollider

SuperCollider is a realtime software synthesizer. Rohan Drape has written wrappers to OpenSoundControl system and SuperCollider. With these packages you are able to control the SuperCollider server by Haskell instead of SuperCollider's built-in language and you can perform interactive SuperCollider sessions from within GHCi.

There is also on-going effort to use SuperCollider and Haskell for speech synthesis.