Better put this on hold because there seem to be something wrong with the schematic.
I'll fix the layout as soon as it will be corrected.
The Warden is an optical compressor with a feature set usually reserved for studio grade units. Built with high grade components and internally powered by 18v, The Warden has loads of gain and sustain on tap. With complete control over attack, release, sustain and ratio, The Warden will allow everything from a heavy squash with fast attack and release to “barely there” subtle compression. Optical compression has a reputation for having more character than a VCA or FET based compression and The Warden is no exception.
This is based on the latest schematic.
The 2M2 resistor is used to tweak gain and sustain to the mounted optocoupler.
You can find the original FSB thread here
03/02/2016 Layout Updated:
Changed 1M resistor between IC1 pin 3 & 5 to 10M and inverted D6.