Dysphonia

Full Voice Synthesizer

Analog Oscillator with 4 waves
3x Analog VCA
Passive Signal Multiplier
CV and Audio 3-to-1 Mixer
High precision MIDI to CV/ Gate converter
1ms/stage Snappy AD Envelope
Wide range Analog LFO
24dB 4-pole Analog Self-Oscillating Low Pass Filter
12dB 2-pole Analog Multi mode Filter
Hybrid Echo (as found on the Erebus synthesizer)

https://www.dreadbox-fx.com/dysphonia-diy-kit/