16-output MIDI to CV/gate interface. Four CV outputs and twelve gate outputs, all universally reconfigurable via SysEx patch. Supports triggers, gates, clock divisions, polyphonic CV, velocity, CC, pitch bend, aftertouch, and transport.621
Capabilities 3
Clock Sourceclock-source
Gate outputs can be assigned to fire at MIDI clock divisions ranging from 1/32nd note (3 ticks) to whole note (96 ticks), plus 24ppqn.621
MIDI to CVmidi-to-cv
4 CV outputs (A–D) and 12 gate outputs (1–12), all configurable via SysEx. CV outputs support note pitch (1V/oct, 8-octave range), velocity, CC, pitch bend, aftertouch, BPM, and fixed voltage. Gate outputs support note gate, trigger, retrigger, clock divisions, transport, and CC threshold.621
Polyphonic CVpolyphonic-cv
Up to 4-note chord or cycle polyphony across the four CV outputs, using Note Input chord/cycle modes (2, 3, or 4 note).621
Jacks 17 — 1 in / 16 out
Name Signal Voltage Description
Inputs (1) MIDI IN mixed — 621 Outputs (16) CV A cv 0V to 8V Analog CV output, assignable to note pitch (V/oct), velocity, CC, pitch bend, aftertouch, BPM, or fixed voltage. Default: channel 1 note pitch.621 CV B cv 0V to 8V CV output B. Default mapping: note pitch on MIDI channel 2.621 CV C cv 0V to 8V CV output C. Default mapping: note pitch on MIDI channel 2.621 CV D cv 0V to 8V CV output D. Default mapping: note pitch on MIDI channel 4.621 Gate 1 gate 0V to 5V 621 Gate 10 gate 0V to 5V 621 Gate 11 gate 0V to 5V 621 Gate 12 gate 0V to 5V 621 Gate 2 gate 0V to 5V 621 Gate 3 gate 0V to 5V 621 Gate 4 gate 0V to 5V 621 Gate 5 gate 0V to 5V 621 Gate 6 gate 0V to 5V 621 Gate 7 gate 0V to 5V 621 Gate 8 gate 0V to 5V 621 Gate 9 gate 0V to 5V 621
Parameters 1
Name Type Range Behavior
Reset Button button — Press and release to reset all outputs: clears held MIDI notes, turns off all gates, sets all CV outputs to zero, resets note cycle modes to first note, resets clock dividers. Also used at power-up for firmware upload mode.621
Firmware history 2 versions
Version Released Notes
4.2 2018-09-10 Corrected a problem where gates listening to specific MIDI notes might trigger on the wrong note when an active note input shares the same MIDI channel. Corrected a problem skipping MTC and SPP messages which could result in message misinterpretation and random outputs.621 4.0 2018-08 Stock firmware currently shipping on the Mutant Brain.621
References 2
[621]
Hexinverter Mutant Brain User Manual v1.0.0 manual
● verified 2026-05-21
[622]
Hexinverter Mutant Brain product page product_page
● verified 2026-05-21
Specifications
HP 8
Depth 30mm
+12 V 50mA
−12 V 4mA
+5 V —
Jacks 17 (1 in / 16 out)
Parameters 1
Capabilities 3
Firmware 2