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Bubblesound Instruments SEM20 VCF Two-Pole Filter Module

Bubblesound Instruments SEM20 VCF Two-Pole Filter Module

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Page last updated Feb 13, 2026

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Description

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Discover the Bubblesound Instruments SEM20 VCF Two-Pole Filter Module, an essential addition to your modular synthesizer setup. This dynamic module brings the classic sound of the original SEM filter to your Eurorack, offering a rich, analog character that will enhance any sonic landscape. Its design is inspired by the revered Oberheim SEM filter and provides a versatile palette for sound shaping, whether you are crafting lush pads, gritty bass lines, or evolving textures.

The SEM20 VCF is designed to be highly responsive to modulation, allowing for intricate manipulation of your sound. With its dual-input configuration, you can easily integrate it into complex patches, making it a favorite among experimental musicians and sound designers. The module features both low-pass and band-pass filtering, offering you more creative freedom in sculpting your audio signals. Its smooth and musical filter response ensures that whatever you create, it will be full of warmth and character.

Perfect for both seasoned modular enthusiasts and newcomers to the world of Eurorack, the SEM20 VCF Two-Pole Filter Module offers a robust and reliable addition to any synth rig. Experience the charm of vintage synthesis with modern precision.

Key Features:

Two-pole filter based on the Oberheim SEM design
Low-pass and band-pass filter modes
Highly responsive to modulation for intricate sound design
Dual-input configuration for versatile patching
Warm, analog filter character

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Bubblesound Instruments SEM20 VCF Two-Pole Filter Module.

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The Bubblesound SEM20 is highlighted for its smoothness and lack of self-oscillation, contrasting with more aggressive filters like the Polivoks.
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Bubblesound SEM20 is likened to the DIOD filter, which offers a sound between a transistor ladder and a SEM filter.
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Features and functionality

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The Bubblesound SEM20 is noted for its clean filtering capabilities, making it suitable for users who prefer smooth, non-crunchy sound profiles.
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It's noted that the Bubblesound SEM20 is particularly smooth, making it ideal for processing chords and pads.
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Use cases and applications

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Ideal for users seeking a filter that maintains clarity at the end of a complex signal chain, due to its clean output and non-self-oscillating nature.
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The SEM20 is suitable for users needing a filter that's not overly aggressive, maintaining a smooth resonance.
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User experience

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It's emphasized that the Bubblesound SEM20 provides a polished sound without the harshness that can occur in some other filters.
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Music Producer

All Hail The Silence

Verified via Telly

Six seconds into BT's Telly video, BT's left hand reaches just above an SEM20 module. The "V|S|F" can be seen below the brightest green light in the shot.