” Here is a Yamaha TX81Z FM Tone Generator. I tested this with drum sounds from a Roland SC-33 to the MIDI input and played with the different tones. Everything seems to work fine. It does have a few cosmetic issues with scuffs and scratches and glue residue on the bottom from thin foam being glued down. It has lived a good life and it shows but it can still go on. A stereo headphone jack was added on the back, it is wired in parallel with the data entry buttons via the ribbon cable from the front board to the motherboard. They must have used it for a remote function but not sure why. It does not interfere with the function of the data entry buttons. I will also include a large blueprint of the electronic drawing. A manual for this can be found online. ” Click here to visit listing on eBay
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