1975 Oberheim FVS-1

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via this auction

"For your consideration is a beautiful Oberheim Four Voice. The synth has been serviced recently and is in very good shape. The original tolex, on the body of the synth was replaced with white vinyl material sometime in the 1970's. It still looks good, and the lid to the Four Voice still has it's original black tolex.
Only offering local pickup for this big one.

The Oberheim FVS-1 (Four Voice) is a 49 key, polyphonic analog synthesizer, featuring dual oscillators (with sync), resonant multimode (low, band, notch, or high pass with FM) filter, dual ADS envelopes, an LFO, 16 presets, proprietary tape interface, and CV IO.

Oberheim only made about 800 of these between 1974-79. Each voice has its own module each containing all analog synthesis with 2- voltage controlled oscillators per voice module and with some external programming capability. There is a two-pole multimode VCF, VCA, two ASR envelope generators, and one LFO. Memory contains 16 presets, VCO:8 (sawtooth, square or pulse), LFO:4, Portamento, Vibrato,VCF(bandpass, lowpass, notch, highpass)
This model includes the Polyphonic Synthesizer Programmer which stores 16 patches per voice and was recently fully serviced and calibrated (over $800 service). Includes the cover and a well-used but readable original manual."