Groove Electronics MINI-CV MIDI to CV Converter

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via this auction

"Here's a quite obscure and rare British-made MIDI to CV converter - I have had this working and it seemed to track over a small range but I didn't spend much time experimenting with the scale/tuning trims. Due to the condition (it's metal construction but the body is quite worn and a few bits are a little warped) and having not explored it hugely, it's got to be sold as seen.

Features:
MIDI IN Port
MIDI Thru Port
MIDI Channel Select Trimmer
3.5mm "GND Trig" Output
3.5mm "+VE Trig" Output
3.5mm Control Voltage Output
Tune Trimmer
Scale Trimmer
Doesn't include PSU - it requires 12V DC Negative Tip, Positive Ring"