Here we show a mod that allows having both stock Buffered Bypass, or True Bypass. We add the master TRUE BYPASS stomp switch in the middle. When it's off, the pedal is true bypassed. When it's on, the stock switch chooses between ON=Overdrive, OFF=Buffered bypass. We run it into an EB 6181 volume pedal so you can hear the difference in the bypassed tone.
It can be hard to understand. It's easier if you think of the new round STOMP switch as a separate TRUE BYPASS LOOPER box. Then it's pretty easy to understand. That's actually exactly how it works too.