Available as an assembled Module and as a DIY project.
This Module is currently available.
VCA and Comparator
VCA / Comp is a single column utility module consisting of an OTA Based Voltage Controlled Amplifier and a Comparator.
VCA:
OTA Based VCA
AC / DC COUPLED
80dB Dynamic Range
Comparator:
Inverting and Non-Inverting CV Inputs
Manual Threshold Level Control
These merchants probably sell this module. Huh?