I finished up a custom build of this MP Custom FX Germaniac guitar overdrive pedal for a regular client yesterday. The client wanted four additional always-on blue LEDs to indicate the corners, which meant creating an additional tiny board to house their resistors and wiring.
This pedal is LOUD, crunchy and trebly. Naturally, I tested it with a synth. I don’t have guitars around here. But yes, I can build guitar effects!