How about GND IMP (MD) or GND noise (MnM) only, with the goal of doing something approaching Karplus Strong synthesis?
That'll sort the men from the boys
http://en.wikipedia.org/wiki/Karplus-Strong_string_synthesisIn theory it should be possible although I have never tried it, would probably have to use a CTR RE machine on the MD as well, but I think CTR machines are ok as they do not directly affect the sound, just the control of it.
Personally I think using a DAW for processing defeats the object of it, if the goal is to push the machine to new horizons?
Anyone up for that? If not I might have a go anyway