Amazon.com: New Hand Made ABY Switch Box For Effects Pedal-True Bypass/ Guitar AB : Musical Instruments
DIY AB not Y | TalkBass.com
Build Your Own Guitar Amp Foot Switch (Under $15) - YouTube
Amp channel switch. LED question
A special mini amp channel switcher/FX loop pedal (When you actually only use 1 of the 2 functions and the other is always on or off) Details in comments. : r/diypedals