The Really Cheap Compressor uses a couple LED's and an LDR.
Hoboken Library gets a new director.
Beavis Audio Research makes pedals and has a lot of groovy pedal designs.
The DIY Layout Creator. Actually, I'm not entirely sure what that's about.
Wingspan is a game.
IN: marshall bluesbreaker without diodes
IN parallel: bright and clean boost : compressor
An optical compressor circuit in pdf. The vactrols stopped production and then someone started making knockoffs.
Market share (not factual just a theoretical) from https://www.youtube.com/watch?v=tuTMJoweL7Y
30% Guitar Center/Musicians Friend
30% Sam Ash, CME, Mom&Pops