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"Here's your chance to own this rare historic synth. All knobs, keys, pots and wood-housing is original. Everything has been cleaned and everything is functioning. This thing produces beautifully warm bass and lead sounds. And the ring modulator will take you into some wild sci-fi territories too. Only major blemish is a chipped key (see last photo) key still is fully functional.The Korg 770 is a monophonic analog synthesizer introduced by Korg in 1976. Based on the same circuitry as the two-VCO version of the Mini-Korg, the 770 offered a more conventional re-packaging, and some control improvements to make the synth more versatile.
VCO 1 offered five choices of waveform, with triangle, sawtooth, square, pulse, and a pulse-width-modulated (rate controlled by an LFO) pulse wave on tap, or an external input could be selected. The VCO included an octave select switch with six settings, including a 64' deep bass setting. VCO 2 produced only a sawtooth wave, or it could be ring modulated against VCO 2, or any of three varieties of noise could be selected. The tuning could be offset from VCO 1. A blend control allowed the user to select the mix of the two signal sources. Other controls at the right side of the panel allowed the user to apply an "auto bend", or vibrato controlled by a dedicated LFO separate from the main LFO. (There were no pitch or mod wheels.)
The voltage controlled filters were the same low pass
- high pass pair used on other early Korg synths, with the two horizontal slide controls labeled "Traveler" for controlling the cutoff frequencies, which could also be controlled via an accessory pedal that connected to the synth via a 5-pin DIN jack. A switch allowed for three possible settings of resonance for the filters; other switches provided settings for how much of the envelope generator and LFO signals should be routed to control the filters. Like other early Korgs, the envelope generator had peculiar controls that effected multiple segments and interacted in ways that were not always obvious, although the 770 did provide more control options than the Mini-Korg."
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