BlaknBlu Foxtrot Duo - Dual Stereo Filter with 3 Classic Models

BlaknBlu’s Foxtrot Duo delivers the sonic flavor of three legendary analog filters inside a powerful dual digital filter module for Eurorack. Whether you're sculpting a mono bassline or adding motion to stereo textures, this multi-mode filter combines vintage warmth with modern flexibility.

At its core are three meticulously modeled filter circuits:

• Moog-style ladder filter for creamy low-end and liquid resonance

• Sallen-and-Key circuit, inspired by the Korg MS-20, which can scream when pushed

• Oberheim SEM-style filter, offering smooth transitions and a velvety band-pass

The Foxtrot Duo isn’t just about switching between filters — you can morph between low-pass, band-pass, and high-pass modes for each filter type, opening up shifting timbres that feel organic and alive. A dedicated Aux CV input can control this morphing, or be reassigned to resonance or stereo panning.

With dual inputs and dual outputs, you can run the Duo in stereo, or sum both channels for a mono signal with stereo movement. The Boost switch adds analog-style saturation to the signal — especially juicy in the Sallen-and-Key mode — and a soft clipper with LED indication helps keep peaks under control.

Perfect for filter sweeps, dynamic stereo processing, or gritty drive effects, the Foxtrot Duo is compact, characterful, and ideal for sound designers, techno producers, and modular enthusiasts alike.

Features:

• Three filter models:
  • Moog-style ladder
  • Korg MS-20 (Sallen-and-Key)
  • Oberheim SEM

• Morphable filter modes: LP / BP / HP

• Stereo or mono operation

• Dual inputs with attenuators

• Two CV inputs for cutoff (one with 1V/Oct tracking)

• Assignable Aux CV input (morph, resonance, or stereo spread)

• Boost switch for analog-style saturation

• Soft clipper with LED indication

• Detailed virtual analog modeling

• Compact and skiff-friendly design

Available in-store for demo
• Three iconic filter circuits
• Morphing filter mode control
• Dual channel stereo or mono operation
• Boost drive and soft clipping
• CV control over cutoff, resonance, morph and stereo
• 100% digital, virtually analog
• 10HP