Bubblesound SEM20st: The Soul of Vintage Filtering

The SEM20st is a compact version of the classic SEM-inspired filter, offering the smooth and airy response that makes Oberheim-style circuits so desirable. The module features a "State" control that allows you to transition smoothly from Low Pass to High Pass, passing through a deeply musical Notch filter in the center. Because the SEM architecture is state-variable, it offers a wider, more open soundstage compared to traditional transistor ladders. Housed behind a premium black-anodized faceplate, it is an essential VCF for those seeking rich, vintage-inflected textures.

Key Features:

• 12dB Multi-mode Architecture: Classic state-variable design for versatile sound sculpting.

• Seamless State Morphing: Single-knob control to move between LP, Notch, and HP modes.

• Musical Non-Resonant Drop: Does not cut low frequencies as resonance is increased.

• CV Control: High-resolution inputs for cutoff frequency modulation.

• Professional Black Aesthetic: Durable black aluminum finish with high-contrast labeling.

Technical Specifications:

• Width: 6HP or 8HP (Depending on version).

• Depth: 25mm (Skiff friendly).

• Filter Type: 12dB/octave State Variable.

• Current Draw: +30mA (+12V), -30mA (-12V).