The Voltage Modular Synthesizer Expander Module is an emulation of the classic OberheimĀ® Synthesizer Expander Module, aka the "SEM." Originally released in 1974, the keyboardless, mono SEM module was intended as a companion to the Oberheim DS-2, one of the earliest digital sequencers. Soon thereafter, Oberheim realized they could interface a digitally scanned keyboard, mount the whole mess in a big box, and create polyphonic synthesizers, beginning with the Two Voice, followed by the Four Voice, and finally the beastly Eight Voice (be sure to check out Cherry Audio Eight Voice, our super-rad virtual instrument emulation).

Though it was a simple, barebones monosynth, the SEM sounded fantastic, and had a tone quality very different than the common fuzzy, fat Moog sound, thanks to its 12 dB/oct state-variable filter. With lowpass, bandpass, highpass and notch modes, this flexible filter was the star of the show. We've precisely recreated it here with a filter section and Phasor effect programmed by award-winning synth designer, Mark Barton (MRB).

Technical Assistance
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Disclaimer: OberheimĀ® and SEM are trademarks of Tom Oberheim/Marion Systems LLC. There is no association, affiliation or endorsement of Cherry Audio or its products by Tom Oberheim.

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