“Yamaha TX81Z FM Synthesiser Module.
A classic FM synth. 8-voice polyphony. 4 FM operators per voice with 8 waveforms.
Condition is good, just one or two scuffs. Unit is tested and working. I have checked the internal battery and it’s good, voltage 3.26V
Unfortunately the slide-out user instruction ‘tray’ is missing. Programming using the front panel controls is mind-numbing though. Fortunately editor programs are available (see below).” Click here to search for synths on eBay