DSP

There is also an old package for classical digital signal processing, with Fourier transform, Filter design and many other goodies. It's not primarily intended for sound processing or even music composition.

• Original project page at SourceForge

Package dsp

Hackage	http://hackage.haskell.org/package/dsp
Repository	darcs get http://code.haskell.org/~thielema/dsp/