Oberheim SEM-PRO

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Page last updated Jan 15, 2026

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Description

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The Oberheim SEM-PRO synthesizer expander module is a testament to Tom Oberheim's legacy in the world of analog synthesis. This powerhouse of sound design is fully analog, featuring two oscillators for rich, dynamic tones and an LFO for versatile modulation options. The SEM-PRO stands out with its innovative MIDI to CV conversion capability, allowing seamless control through MIDI while interfacing with your CV-equipped gear. With 21 CV patch points at your disposal, this synth is perfect for those looking to dive deep into modular synthesis.

Designed for modern musicians who crave the warmth of analog sound, the SEM-PRO offers a five-octave range and responsive aftertouch, making it an incredibly expressive instrument. The built-in portamento adds a classic glide between notes, enriching your musical expression. Whether you're in the studio or on stage, the SEM-PRO's robust construction ensures it stands up to the demands of live performance.

Moreover, the dual audio inputs invite external signals into the mix, opening up a world of possibilities for sound processing and modulation. Whether you're a synth enthusiast or a professional musician, the Oberheim SEM-PRO delivers timeless analog sound with modern capabilities.

Key Features:

True analog synthesis with two oscillators
MIDI to CV conversion for versatile control
21 CV patch points for modular synthesis
Five-octave range with analog portamento
Responsive aftertouch for expressive play
Dual audio inputs for external signal processing
Rugged design for live performance reliability

Videos

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Perfect Circuit

Tom Oberheim Two Voice Pro Analog Synthesizer Demo

Perfect Circuit

Oberheim SEM Pro + Eventide Space = Demo

once upon a synth

Oberheim SEM Pro = Basic Sounds

once upon a synth

TOM OBERHEIM SEM PRO 70s SEQ DEMO

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GForce Software Oberheim SEM vs SEM Pro

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ROLAND SYSTEM 100 MODEL 101 + TOM OBERHEIM SEM PRO ~ Will They Pair? Ep.31

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Sequential Circuits Pro One, TR 808, Oberheim SEM PRO with

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Oberheim SEM-PRO.

Features and functionality

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The SEM filter offers continuously variable modes, smoothly transitioning between lowpass, notch, and highpass, which is rare among synths.
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The OB-Xa and OB-SX utilize Curtis SEM3320 chips, allowing lowpass filtering with switchable 2-pole and 4-pole modes.
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Comparisons

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The SEM filter is considered more unique and versatile than the OB-X, which is better suited for classic '80s sounds.
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Arturia SEM and OB-Xa emulations sound different due to distinct filters; SEM uses the SEM filter, while OB-Xa uses the Curtis filter.
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