Drumbrute Mods

The Problem: Only two assignable outputs? For a 17-voice drum machine, that’s criminal for external processing.

The Fix: Inside the DrumBrute, there is an unpopulated 10-pin header (J26 on the main PCB) that carries pre-VCA, pre-pan direct signals for Kick, Snare, Tom Low, Tom Mid, Tom High, Clap, Closed Hat, Open Hat, Ride, and Crash. You can solder a ribbon cable here, route it to a custom panel of 1/4" TS jacks, and drill holes in the metal case.

Pro Tip: These signals are at modular level (approx 10V p-p) and are not buffered. If you run cables longer than 10 feet, you’ll lose high frequencies. Use a simple op-amp buffer (like a TL074-based circuit) for each output if you need long runs.

Result: Individual compression on the snare, distortion on the clap, reverb only on the cymbal. The DrumBrute transforms into a studio workhorse.

Difficulty: ⚡⚡⚡⚡ (Intermediate – requires case drilling and careful pin mapping) drumbrute mods

Purpose: Provide standard 5-pin MIDI connectivity. Materials: MIDI DIN sockets, opto-isolator (for MIDI IN), 220–1k resistors, wiring. Steps:

The DrumBrute contains a 12dB/oct analog filter. While it can self-oscillate, its input gain is set conservatively to avoid distortion.

The Concept: Locate the audio input path to the filter circuit. By soldering a connection from the pre-filter audio bus to a potentiometer acting as a voltage divider (gain control), you can overdrive the filter input, creating a gritty, aggressive distortion similar to early Roland TR circuits.

Implementation:

Title: Arturia DrumBrute Modification Guide (various authors on ModWiggler & r/synthdiy)

  • Where to find it: Search ModWiggler forum for "DrumBrute mods megathread" or look in the Files section of the Arturia DrumBrute Facebook group.

    • These require designing small daughterboards.

    Why: Stock mutes have no dedicated LED – you just see the step buttons.

    How:

    These require cutting existing traces and adding new hardware (jacks, switches).

    Warning: Proceed at your own risk. Modifying your equipment will void the warranty. Incorrect soldering can permanently damage the unit.

    Tools Required: