Emexar with two 2P6T boards for the positive and negative diodes, each allowing selection of red LED, blue LED, 1N914 + LED, 2x 1N914, 1N270, or D2J diodes. Afterblaster with a 3PDT stomp switch and external control. The wiring is a bit too spaghetti, but I was having to do some trial and error and needed some slack for it.
Quick note: I tried these cool looking color-changing LEDs from Ada Fruit. They are not suitable for audio applications. There’s a faint but audible change in pitch of the the noise floor right at the end and beginning of the fade/color change. https://www.adafruit.com/product/679