Yamaha MU100R, rack effector MIDI sound module, keyboard synth. I plugged my Prophet 600 into this and did get synth sounds out. I don’t use midi so I have no idea how to fully test, so sold as is cheap. I don’t have the power supply - borrowed one from my modem for testing. Takes a Yamaha P5B 12V unit. No returns unless not as described or damaged in shipping.