Korgopsix 37-key altered FM synthesizer. Sounds and functions great — this is a seriously deep and flexible FM engine in a hands-on, knob-per-function interface. Only reason this isn't listed as excellent: a couple of the encoder knobs fell off at one point and were replaced with aftermarket knobs that don't quite match the original look/feel (fully functional, just cosmetically not OEM). Everything else about the synth performs exactly as it should. Smoke-free space.