Three voltage controlled amplifiers.

• Manual BIAS control for each VCAs.
• CV control with attenuator for each VCAs. CV input C normalled to CV input B, CV input B normalled to CV input A.
• Independent CV control (without attenuator) for A and C VCAs.
• Bi-color led for indicate input CV signal for each VCAs.
• Out signal from VCA A and VCA B always mixing (A+B out).
• Input C normalled to A+B out.
• Diode protection on reversed power supply.
• CNC milling front panel (2 mm FR-4 or aluminum front panel option).
• Handcrafted in Russia.
  Function diagram here.

https://www.youtube.com/watch?v=M30fG_eoV9w&t=433s