That's pretty nifty, Windsurfer - thanks for posting the link. The sorts of things he was doing would be very helpful for people doing that sort of loop based dance music. These are features for a step sequencer though, not a PRV.
RB
Sonar X3e Studio
Roland A-800 MIDI keyboard controller
Alesis i|O2 interface
Gigabyte Technology-AMD Phenom II @ 3 GHz
8 Gb RAM 6 Core Windows 7 Home Premium x64
with dual monitors