I’ve uploaded a track up onto soundcloud, it was done by me jamming along with a Kaossilator pro and a generative music app for the iPad / iPod called soundzen.
Soundzen is similar to a lot of online flash applications and although very basic you can generate some very pleasing patterns.
It comes with 4 free soundsets and you can purchase extra sounds such as guitar by an in app purchase (69p in the UK)