Orange Squeezer - Build your own compressor guitar pedal kit | eBay
Proto Pedal Example: Programmable Digital Pedal - SparkFun Learn
Guitar Pedal X - GPX Blog - Drunk Beaver reinvents the classic overdrive pedal as the wonderfully Resonant, High Voltage, and Enhanced Harmonics Multi-Clipping The Forest Song
PROTIS 1 Guitar Effects Development Board - Stompbox Electronics
Proto Pedal Example: Programmable Digital Pedal - SparkFun Learn
PROTIS 1: Guitar Effects Development Board - Stompbox Electronics
Guitar Pedal X - GPX Blog - Drunk Beaver's 19th Pedal Drop is a killer confection of Boss OD-1 style 14-Leg Opamp tone generation, with OD-3 style Tone-Stack and additional clipping options