On Jan 24, 2010, at 8:50 PM, John Mahoney wrote: > I've had ball bearings in mind since someone used them in a > sequencer (?) -- a lovely project of which I can remember little else. Maybe this? http://www.youtube.com/watch?v=uKtisFD3PHE&feature=related or this? http://www.youtube.com/watch?v=wreP8FMupyM&NR=1 Sam E.