The Doepfer A-121d Multimode Dual Filter (Vintage Edition) is a dual multimode filter module built around a fresh Doepfer-designed filter circuit. With a sleek black panel and retro-style knobs, this Vintage Edition offers deep sound shaping with visual flair.

The module features two fully independent filters—Filter 1 provides highpass and bandpass outputs, while Filter 2 delivers lowpass and bandpass. Each filter has its own audio input and dedicated output jacks, but they’re also normalled into a built-in two-channel mixer for immediate creative blending.

A shared cutoff knob with an additional delta parameter lets you control both filters simultaneously while offsetting their cutoff frequencies—perfect for stereo movement, formant filtering, or phasing effects. Separate resonance controls for each filter offer expressive contouring, and if needed, a trimmer tweak enables self-oscillation on the back, turning the A-121d into a dual sine oscillator.

With individual CV inputs, flexible routing, and mixable outputs, the A-121d is a unique and powerful filter tool—whether you're shaping audio or generating complex CV textures.