Erica Synths Hexinverter Mutant BD9 Bass Drum Eurorack Module

When a kick drum needs to hit harder and cut deeper, the Erica Synths Hexinverter Mutant BD9 Eurorack module delivers unmistakable analog punch. This analog module combines voltage-controlled distortion with the classic character of the TR-909, all within a compact 13HP footprint. The primary oscillator delivers 909-style sine bass drums, but with a flick of a switch, users can unlock square wave bass sounds. The unit’s output level is modular-ready, providing a punch that can cut through any live setup or studio mix. Producers searching for aggressive kicks and deep tonal sculpting will find the BD9 module offers a precise, hands-on experience that goes far beyond typical drum synths.

Parametric Analog Kick Synthesis With Integrated Sub Power

Rather than revisiting familiar 808-style territory, the Mutant BD9 is built around a parametric bass drum synthesis engine designed to push beyond traditional analog kick designs. Its primary analog VCO delivers classic 909-style sine bass drums, with a switchable square wave option for a more aggressive edge. A wide pitch range (approximately 30Hz–240Hz) and a dedicated Pitch Decay circuit allow everything from tight transient hits to exaggerated, tom-like sweeps, while voltage-controlled Amplitude Decay shapes kicks from short and punchy to massive and booming. The Click generator sharpens attack definition, and the Drive control moves from warm analog saturation to speaker-threatening distortion. When deeper impact is needed, the integrated square-wave sub-oscillator—mixable manually or via CV with selectable octave and filtering options—adds anything from subtle weight to evolving low-end obliteration. With extensive CV control, flexible triggering and accent input, the BD9 is an expressive, performance-ready kick module built for modern modular systems.