YAMAHA CS50

via this auction
"The CS-50 was released just one year before its famous big brothers, the CS-60 and CS-80. The CS-50 looks like a scaled-down version of the monstrous CS-80, and it is! This will benefit those who crave the famous classic Yamaha synth sound without the struggle of lugging around the 215 pound CS-80! The CS-50 weighs in at about 100 pounds. The CS-50 is also just 4-voice polyphonic, and lacks the quality weighted 61-note keyboard of the CS-80. The CS-50 has just a 49-note standard keyboard. It does feature pressure (aftertouch) sensitivity route-able to several destinations, however.The CS-50's sound is unmistakably related to other classic CS-series synthesizers. "From 1975, it's the little brother of the Yamaha CS80 (the famous "Blade Runner" Synth). This board was amazingly ahead of it's time in it's polyphonic implementation. If you recall, the majority of the big names at that time were strictly monophonic. This guy came out and featured 4 key polyphony and an early form of aftertouch that can affect the filter, VCO or LFO. There is also a auxillary input to run sounds through the side panel which I have used on a couple of tracks.Small or not, this still weighs close to 100 lbs and is the size of a small organ. There is a really great sounding ring modulator for crazy sci fi sound, 13 presets and a full synthesizer section including both HP and LP resonant filters. Specifications Polyphony - 4 voices, monotimbral Oscillators - Four (1 VCO per voice) LFO - One Filter - 12 dB/oct lowpass and highpass filtering Effects - None Keyboard - 49 keys (pressure sensitive, route to various destinations) Memory - 13 preset, 1on panel Control - CV/Gate Date Produced - 1976"