Available as an assembled Module and as a DIY project.
This Module is currently available.
4HP compressor
4HP Compressor designed for continuous adjustment of gain, threshold and compression ratio with a single potentiometer.
There is also a knob for input level and a knob for make-up gain.
The module is based on high-performance THAT4305 Blackmer® VCA chip.
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These merchants probably sell this module. Huh?