This is a video I made Christmas Eve 2009 with my Jazzmutant Lemur. Bumpalizer can do some really neat things.
With Bumpalizer, you can program the independent pitch of each ball directly in the interface, over 2 octaves, as well as the general root key. There is also a random speed function, to create psychotic glitch irregularities.
Bumpalizer is a free download from JazzMutant.