"This MC-202 has one mod--It has a FINE TEMPO knob, like TR-808 has. It is all working fine with no scratchy pots or sliders. The battery compartment is nice and clean. (see pics). Can run on batteries or 9-12v ac adaptor. It doesn't include the power supply --I will include a set of batteries. A word to the wise -it is much safer to use the TB-303's, 606, MC-202 with batteries as they are kinder to the electronics. If you insist on a power supply get the HFA electronics NZ made Roland replacement for $25 direct from manufacturer. This is a great sequencer/synth which is a kind of half way between a TB-303 and an SH-101. The synth section is basically a SH-101 synth, more than capable of 303-style blips and squelches, plus much more. The sequencer is actually quite powerful for what it is and not difficult to use. It has two channels, so can control a 2nd synth via CV, and importantly has controls for portamento and accent, essential if you're trying to make it sound like a 303. Syncs to TR606/626/707/808/909/303 via Roland DIN sync, or get yourself a MIDI-DIN sync converter and sync it to your "modern" equipment.
Info and sound samples
MC-202 hack"