I have one, lots of issues with it though - the sequencer board died not long after I got it due to battery leakage, dead buttons and pots, issues with triggering from the pads. They are now pretty much impossible to source replacements for.

The computer interface thing is pretty unique, I was planning to try and reverse engineer it before the sequencer died. The inbuilt sequencer was pretty limited anyway.
I did rig up some external triggers to drive it from the modular but the thing is so bloody big it's a bit impractical really. The pad action is pretty awful BTW (when they do work on mine). The voices are nice but nothing that special, pretty much standard Twin-T resonator circuits like most every other old analogue drum machine. The most unique aspects are the hi-hat sounds and the parameter control over the voices, and the dynamic control from the triggers.
If you need them I have some (very rough) schematics somewhere.
Cheers
Blair