About operand
A sixteen track step sequencer, capable of taking a folder full of samples [aiff/wav/mp3] and turning them into something new, something, well, granular.

with the edition of:
- drag and drop sample folders [aiff/wav/mp3].
- effects [filter, stutter, stereo delay, reverb].
- key controls [sample hits with keyboard, tap tempo].
- random pitch/pan/duration.
- global step/clock controls.
- dedicated channel step and clock controls, for managing of odd sequences.
- external audio recording.
- plus much more.

Read more: http://www.apple.com/downloads/macosx/audio/operand.html