images via this auction"Oberheim Synthesizer Expander Module model CPS-1, S/N 508. The SEM was Oberheim's first official analog synthesizer. It was conceived with the notion of being used as a backup synth connected to a sequencer for layering or beefing up your existing monophonic analog synths. The SEM itself is a keyboard-less module with two analog oscillators, a 2-pole filter, ADR envelopes, and an LFO. Each of the two oscillators offer triangle or rectangular waveforms."
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