via this auction
EVERYTHING SYNTH
"This is second edition of Erica Synths ACIDBOX that brings you emulation of widely recognized classical Russian synthesizer Polivoks Voltage Controlled Filter (VCF), packed in small desktop unit and enhanced with features for contemporary electronic music performances.
Erica Synths ACIDBOX II sound circuit is built around rare Russian ICs, that were used in the original Polivoks synthesizer back in 80-ties, therefore you get that famous analogue sound, insane resonance sweeps and straight forward, hands on control. ACIDBOX II has significant improvements compared to the first version: redesigned LFO with the new waveforms and audio rate modulation capabilities, built in analogue noise generator, balanced output and many others.
"When developing Erica Black Series and Pico Series modules, we accumulated quite a know-how on compact and great sounding designs, and we decided to share some of those with DIY community. And therefore Erica Synths proudly presents – DIY Synth Voice module!
18 September 2019, London: Ninja Tune and Riga-based modular synth manufacturer Erica Synths have teamed up to create a custom dub delay effects unit, the Zen Delay. 
In this modulation, the connected Scaler raises the modulation range via CV2.Erica Synths-Black CV Tools modulation 2
Erica Synths-Black CV Tools modulation is a small patch with the use of Noise from Black Modulator and LFO and Black VC EG that is interchangeable for both CV controls here both one knob once to the left once to the right changing their weight for complex modulation.3. Erica Synths-Black CV Tools modulation 3
in this modulation, LFO is applied to the Scaler and scale also modulates the second LFO at a faster rate, which allows for a change between one and the other modulation4. Erica Synths-Black CV Tools modulation 4
Here, Scaler raises and lowers sequences when it is applied to the CV for the sequencer