MATRIXSYNTH: Modified Univox Mini-Korg For Sale

Soundtoys

Thursday, April 23, 2026

Modified Univox Mini-Korg For Sale

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video upload by tonetweakers



via Tonetweakers

"Univox Mini-Korg Synthesizer 700 For Sale. This Minikorg has been meticulously refurbished by perfectionists and is in perfect working order and ready to play.

This unit has some very useful modifications that expand its capabilities.

Adjustable Resonance
The stock minikorg just has a single switch for resonance boost, but this one's got 2 additional rotary pots added for variable resonance of the high pass and low pass filters - it really lets this minikorg scream! This mod alone is a huge improvement over a standard minikorg.

Filter Input
There's also an audio input allowing one to process external sounds through its filters.

Adjustable Chorus Rate
There's a pot to adjust the rate of chorus 1.

Octave and Waveform Mixing
These mods give you the ability to mix waveforms and octave divisions, resulting in a fatter sound. These mods are a bit strange and interact with the octave and waveform switches, so they take a little getting used to.

These additional octave and waveform pots are active at the very top of their range and are more like switches and are sometimes inactive, depending on your settings. Sometimes octave switch settings will cause a drop in volume if the appropriate knobs are not adjusted, and sometimes there will be a change in timbre of the selected waveforms if the knobs are not adjusted properly. It's a bit confusing at first. We can probably remove these mods for you if you'd like so the octave and waveform switches work as they normally would in a stock unit, but this will remove the ability to mix waveforms and octave divisions - please email us to discuss if you'd like these mods removed (we would just remove the wires connecting the mods, not the additional pots).

These mods give this minikorg more sonic possibilities than a stock unit and add value to this example.

We paid our tech for 5 hours of skilled labor to get this unit working great again. In addition to fixing any problems, he did the following servicing:

Cleaned jacks
Replaced all power supply electrolytic capacitors (he says someone previously replaced the other electrolytic capacitors)
Replaced fuse
Cleaned and lubed all pots
Calibrated VCO"

Buy vintage gear that works like new at tonetweakers.com

We buy sell trade refurbish vintage synths and electronic musical instruments."



SN 43584

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