Produced for a limited time in the late 1970's, the Yamaha CS-70M has become one of the most sought-after synths for musicians of many genres. The CS-70M has six voices of polyphony, each supported by two oscillators, for a total of 12 analog VCOs. It has very flexible LFO, envelope, and filter controls. Our tech has gone over this CS-70M, and it works perfectly.