Numerology is indeed a nice piece of software, though it’s been a while since I’ve fired it up.

When I’m not home to play with my Octatrack, I do most of my audio mangling on my iPad. iDensity, Turnado, and Borderlands Granular all have their individual strengths for mangling.

I also do a bit on OP-1, but that’s off-topic since the OP was asking about software.