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The Korg 770 is a two-VCO, monophonic synthesizer with a 32-note (F-C) keyboard.
The two VCOs sit at the top of the panel, one to the left and one to ther right with a mixer section between them. The oscillators can be mixed, ring modulated, or one can modulate the other to create FM sounds. VCO2, the one on the right, can also be a noise generator. The mixer includes a switch to choose one or the other VCO. VCO1 can take external input (like a mic or a guitar) and feed it through the signal path. A very nice feature. Many guitarists used this synth to create unusual sounds.
To the left of VCO1 is the LFO speed knob. Below that is the portamento control, with a switch allowing alternation between knob settings and a fixed port speed. Below VCO1 is the filter section. The low pass and high pass filters are in an unusual, and very useful, stacked configuration, and are sliders, not knobs.
This allows you to make intercepting filter sweeps with one hand, and allows you to get to resonance points very easily. The four switches in this section set the ranges for the filters, 'brightness', and how much LFO to add to the filter path. To the right of the filter section is the envelope/trigger section. Only attck and 'singing' (release) are slider controlled. Sustain is set by a 3 postion 'x1 x10 x100' switch.
Triggering switch allows percussive, sustain, and hold. Another exciting enhancement in this unit was the final button in this setion, triggering. Allows VCO triggering by key, LFO, and remote.
Final section, far right bottom, is other mods. Two mods, tremelo and ptch bend. Tremolo does what you would expect, with speed and delay settings.
This synth comes with the original manuals as shown. I bought it new in 1977 and used it until the early 90's, when it was packed away in a smoke free environment until recently. Of course, there are scratches and worn areas in the back- this instrument was used a LOT. This instrument does not come with any warranties either specified or written. Sale is final: this is a no return item. You are bidding on an instrument which gave me great pleasure to play. Thank you for considering my auction.
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