CDM points out this vid from m~fischer exploring sounds created from varying pieces of a sample –

the strange agency made this great little granular synthesis iphone application called curtis. it’s named for composer, author, granular synth advocate curtis roads. this is just a quick little thing i recorded using a captured bit of sound from a thumb piano. pretty fun little application to play with.

I’ve always found the concept of granular synthesis compelling in theory but a bit unwieldy in practice. Being able to manipulate the sample parameters via touch would likely improve results – just wish Curtis had a way to transfer samples over to desktop audio software.