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This device can turn your semi modular mono synth into a 4 voice poly synth! Bought from Space Brain Circuits (Chicago) a year or so back. I used it for a while with the moog grandmother and it is pretty special hearing it in 4 voice and duophonic mode! Some info from Space Brain Circuits: The MidiVolts Desktop is a MIDI based 5 octave CV controller. The device contains 4 separate CV outputs with an associated Gate output. These CV outputs are called voices, and are named V0, V1, V2, V3. Each voice operates on the 1 volt per octave standard for eurorack and most hardware synthesizers. The device uses 6 different modes (MONO, DUO, UNISON, POLY3, POLY4, CC) to control each voice in different ways. See below for descriptions of each Mode. The device also contains a Midi to Clock output conversion and further customizations with SysEx midi messaging. This version comes with an added USB mini port that allows changing/ upgrading the firmware, which includes Midivolts Split firmware. This allows for different Midi channels to control the various CV outputs independently.

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It packs 16 eurorack compatible outputs into a tiny, super affordable 8HP package. The 4 CV outputs and 12 Gate / Trig outputs are all universally reconfigurable. Triggers, gates, clock divisions and sync signals, polyphonic keyboard playing, velocity, sequencer transport, LFOs – you name it! Configuring your patch is easy – just assign each output as you like in the Mutant Brain Surgery configuration utility, then send the MIDI SysEx file to the module and forget about it – the Mutant Brain remembers it all for you. Hexinverter supply a convenient download pack of pre-configured, ready to use Mutant Brain patches for some select sequencing and drum machine devices on the market today, easily turning those sequencers and drum machines into a modular control powerhouse! Designed with live and studio performance in mind, the Mutant Brain does away with wasted panel space and complex menu-diving interfaces, while freeing you from the limited “auto-learn” type MIDI interface. An auto-learn interface sometimes doesn’t play well with the limitless combinations of different gear setups which today’s modular performers play live with.

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