Arturia MiniBrute Modification

This modificiation expands the Arturia Minibrute’s internal modulation matrix and provides buffered outputs that allow internal control voltages to interface with external modular synthesizers.

These modifications were able to be executed thanks to the schematics provided on HackaBrute.

Modifications Include:

  • Filter FM via Triangle and Saw Oscillator Waveforms; Whitenoise Generator.

  • Pitch Modulation via the Filter Envelope and Whitenoise Generator.

  • LFO Rate Modulation via Filter Envelope, Keyboard CV, Mod Wheel CV,  Aftertouch CV, and External CV input.

  • Oscillator Hard Sync Input

  • Switchable Vibrato Rate: Audio, Sub Audio.

  • Buffered outputs for Mod Wheel CV, Aftertouch CV, Filter Envelope, LFO.
Stereo Interface

(prototype)


The Stereo Interface was designed to be a cost effective solution for bridging modular and non-modular environments.

The Stereo Interface features two unbalanced mono input channels that amplify line level signals to modular level and two unbalanced mono output channels that attenuate modular level signals to line level.

Each input channel features a sweepable single-pole high pass filter with a range of 7 hz - 340 hz, and an amplifier with a variable gain range that can be switched between a factor of x10 and x50. The level of the output signal is visualized by an RGB LED. The LED transitions from blue to green as the signal is amplified into the modular realm. The LED begins to glow red as the output signal approaches eight volts. The input channels feature two outputs, one of which outputs the amplified input signal, while the other can be switched between the amplified input signal and the comparator that drives the LED, which will provide a “gate high” whenever the LED is lit green.

Each output channel features a sweepable single-pole high pass filter with a range of 7 hz - 340 hz, and an amplifier with a variable attenuation range that can be switched between a factor of x0.15 and x0.75. This enables the user to interface their modular system with a wide range of equipment by being able to accommodate various levels of headroom.