Hi, I've been working on and off on a MIDIBox-based portable scratching solution. I have a scratch-capable crossfader hooked up to midibox and working fine (http://www.youtube.com/watch?v=h8e2hHiw1fk) and the next step is some sort of scratch wheel. Right now I'm using timecode vinyl and real turntables, which are a bit unwieldy for gigging. This needs to be more than just a simple jog wheel - it needs to be very responsive to slight movements. I figure I'm going to need 256 (or more) steps per