I actually feel sorry for your signal if you choose to build this.
It will eat it up and spit it out, looking like the thing your cat just regurgitated on your carpet.
With this PCB and just a few parts you can build the weird first version of the Soundwave Breakdown by Death By Audio.
To make this slightly more usable, I added the option to exchange the internal trimpots for Input and Output to regular potentiometer.
Build Docs coming soon