Yamaha DX7S 80s Digital Polyphonic FM Synthesiser - 100VYamaha DX7s Vintage Digital FM Synthesiser. Another classic Yamaha 80's FM synthesiser. Perfect for all your retro sounds, Bass, leads, pads, FM effects etc. Condition: This unit has been used. This DX7s shows a small amount of wear from use and age. This includes some marks, nicks and scratches. Nothing major. Overall it is still a nice piece. This DX7s is functionally excellent as it has been serviced. It has had a thorough test run and diagnostics.