DSP

From HaskellWiki

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.

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