Oberheim SEM with Patchpanel

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$3,508.90

4.0 (3)

2 Critic Reviews

1 Review

This product is Vintage or Discontinued

Find out who is using Oberheim SEM with Patchpanel

5 wishlisted

8 saved

Page last updated Jun 03, 2026

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5.0 (1)

$3,508.90 1 available Used

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Description

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Step into the world of analog synthesis with the Oberheim SEM with Patchpanel—a perfect blend of vintage charm and modern versatility. This synthesizer expander module is a homage to the legendary Oberheim sound, renowned for its warm, rich analog tones. With the 21-point CV patch panel, it offers unprecedented flexibility, allowing you to dive deep into sound design by interfacing seamlessly with other modular systems.

The SEM with Patchpanel is equipped with dual voltage-controlled oscillators, a versatile LFO, and a robust multimode filter, giving you complete control over your sonic landscape. Its analog circuitry ensures that every note you play is imbued with the authentic warmth that only true analog synthesis can provide. Whether you're crafting lush pads or gritty bass lines, this SEM is your gateway to a world of sonic exploration.

Designed for both the seasoned synth enthusiast and the curious newcomer, its rugged build makes it a reliable choice for live performances or studio sessions. External audio inputs expand its capability to process sounds from other gear, making it a powerful addition to any setup.

Key Features:

True analog synthesis with rich, warm tones
Dual voltage-controlled oscillators for expansive sound creation
21-point CV patch panel for enhanced modular integration
Versatile LFO and powerful multimode filter
External audio inputs for processing external sounds
Rugged design suitable for studio and live performance use

Videos

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DavidH

Oberheim SEM PatchPanel first test + usermanual

DavidH

Tom Oberheim SEM - Synthesizer Expander Modul - Patchpanel Version - New - Just Arrived

djessay101

Reviews

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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 with Patchpanel.

Features and functionality

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The Oberheim SEM filter maintains bass presence even when resonance is increased, unlike Moog filters which can reduce bass levels during resonance adjustment.
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The Sequential Pro3 offers three filter types, including the OB-6 filter, providing versatility but at a price nearing the OB-6 Desktop.
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The SEM Patch Panel version includes additional patch points like sync in/out for oscillators and extra filter outs, enhancing modulation possibilities compared to the SEM Pro.
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The SEM's VCA is never fully closed, emitting a faint sound even when not playing, though it becomes inaudible when mixed with other sounds.
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SEMs can be used as a five-voice poly with individual tuning via a Kenton Pro 2000, adding unique detuning effects.
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Comparisons

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Boomstar SEM is highlighted for its authentic SEM filter sound, though it's noted as rare and occasionally expensive in European markets.
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The SEM's 12dB filter offers a more subtle, varied sound compared to the Pro-One's aggressive 4-pole lowpass filter, appealing to users seeking sonic variety.
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Oberheims are noted for their distinctiveness, with users describing the Prophet 08 as unable to match Oberheim's massive sound.
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User experience

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Some owners report the Microfreak's analog SEM-style filter is appealing, but they experienced issues with buggy software and poor build quality.
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The SEM is praised for its smooth sound, excelling in string and higher frequency applications without taking up much sonic space in mixes.
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Mods and upgrades

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For Moog-style bass without losing resonance, routing an external input through the filter can create a feedback loop, enhancing sound dynamics.
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Build quality

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The SEM is described as a light yet sturdy and compact synth, making it portable and resilient for regular use.
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Use cases and applications

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SEM excels when used with other CV/Gate gear or modular setups, offering more value in combination with additional equipment.
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SEM is effective for creating subtle, wistful sounds, contradicting the common perception of Oberheim's bold sound profile.
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Setup and maintenance

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Owners suggest buying Oberheim synths in person due to potential maintenance needs like replacing bushings and calibrating voices.
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Some users report maintenance challenges with models like the OB-Xa, including voice calibration and envelope chip replacement.
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Critic Reviews

Tom Oberheim SEM

soundonsound.com

The Oberheim SEM with Patchpanel review is a nostalgic nod to vintage synth enthusiasts, highlighting the SEM's faithful recreation of its original sound and character. The new SEM impresses with its warm, classic tones and the ability to produce even more potent sweeps, thanks to deeper envelope capabilities. However, it falls short with limited MIDI/CV functions, no memory storage, and a reliance on an external power supply. Despite these minor setbacks, the SEM remains a cherished choice for purists, offering a genuine analog experience that's both immediate and rewarding. For those seeking a true SEM sound, it's a compelling option.

positive

Full Review

tomoberheim SEM review | MusicRadar

musicradar.com

The Oberheim SEM with Patchpanel is hailed as a top-tier analogue monosynth, lauded for its phenomenal sound and classic lineage. The reissue stays true to its roots with a faithful recreation of its original design while offering modern conveniences like a MIDI-to-CV converter or an extensive patch panel for semi-modular flexibility. However, some might find it lacking that a version combining both MIDI and patch capabilities isn't available, which would enhance its versatility. Despite minor criticisms, the SEM's vintage appeal and impressive sound make it a standout choice for synth enthusiasts.

positive

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4.0 out of 5

Based on 1 Review and 3 Ratings

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xxxesq

107

over 7 years ago

Original!

Mine is actually a vintage one from the 70s with a custom power supply and 5U format patch-panel.

Roles:

Guitarist Keyboardist Music Producer

Genres:

Electronic Rock Electronica

Artist usage

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Deadmau5

Music Producer

BSOD

Verified via Synthtopia

The Oberheim SEM with patchpanel can be seen in Deadmau5's studio in the pictures from this Synthtopia article.

Adrian Utley

Guitarist, Keyboardist

Portishead

Verified via YouTube

At 2 minutes into the video. "...for about 18 years now...and I really love it."

clipping.

Rapper, Music Producer

Verified via Photo

Among the gear in this picture, Jonathan Snipes of clipping. has a TR-909, a TR-808, a LinnDrum, an Oberheim SEM, and an MPC 60.

Thighpaulsandra

Keyboardist, Composer

Coil

Verified via Matrixsynth

Incorrect item

Two Oberheim SEM modules with patch points are mentioned in the Matrixsynth post, and the linked Flickr album shows a close up of them. The modules shown are the SEM not the SEM with Patchpanel.