Doepfer A-101-2 Vactrol Lowpass Gate

The Doepfer A-101-2 Vactrol Lowpass Gate brings the warm, organic response of West Coast synthesis to the Eurorack format. Based on classic Buchla circuit concepts, the A-101-2 uses vactrols to combine a VCF and VCA into one cohesive circuit — producing natural-sounding dynamics where brightness and loudness fall together, just like acoustic instruments.

Whether you're shaping percussive hits, resonant FM tones, or creating plucky melodic lines, the A-101-2 delivers dynamic sonic behavior with a beautifully nonlinear response. You can toggle between three modes: VCF only, VCA only, or combined LPG mode, giving you flexible routing options within a patch.

Unlike simpler LPGs, this module includes two CV inputs (for filter and amplitude) and two gate inputs — making it easy to trigger from sequencers, envelopes, or logic modules. And here's the kicker: a dedicated resonance control, allowing the filter to self-oscillate, adding biting harmonic content or chaotic overtones to the otherwise mellow LPG behavior.

Known for its slightly more aggressive tone compared to vintage LPGs, the A-101-2 can move between subtle dynamics and wild sonic experimentation with ease — especially when resonance is pushed.

A timeless utility with a West Coast soul, now in Doepfer’s reliably accessible format.