Vermona Synthesizer with VS-MIDI Advanced MIDI retrofit

via this auction

"Vintage analogue 2 VCO Synthesizer Made In GDR with MIDI retrofit designed by CHD-Elektroservis

2-VCO monophonic analog synthesizer (each saw, 2 square waveforms, noise - all cen be used simultaneously).
24 dB/oct analog VCF filter with 4 knobs (Brilliance, CutOff, Resonance, Contour) - exact copy of Moog filter
LFO to modulate the VCO or VCF sections
ADSR VCA envelope.
Preset VCF and VCA settings as well as a Manual mode

The MIDI Interface
VS-MIDI retrofit enables Vermona Synthesizer to be controlled via MIDI. It controls VCO, VCF, VCA and EG circuits of the instrument. All original features of Vermona Synthesizer are not changed - the instrument can be still used the same way as before the interface installation.

Main Featrures:
VCO Key Shift (0 to +84 semitones)
VCO Pitch Bend Range (+-0 to +-12 semitones)
VCF Mode (EG / Gate / Controller)
VCF Key Follow (+-100%)
VCF Velocity Amount (0 - 100%)
VCF Channel Aftertouch Amount (0 - 100%)
VCA Mode (EG / Gate / Controller)
VCA Key Follow (+-100%)
VCA Velocity Amount (0 - 100%)
VCA Channel Aftertouch Amount (0 - 100%)
EG Retrigger Mode (Off / Fix / MIDI)
EG Retrigger Rate (0,4~20 Hz or MIDI clock)
"Note On/Off" (incl. Velocity sensitivity)"