Note: this post is from 2007, outbound links may be broken.
Shuriken releases Shredder
From the Shredder page:
Shredder samples on your command (via MIDI notes on) and replays (also via MIDI notes) in different modes (choosen by the user) and tweakable pitches (tweakable by the user that is).
Shredder is released as donationware for and you can download a version for Mac OSX and Windows.