Ok.. I have a couple of friends, one has an AB box and the other wants to get one. But I electrically I don't think they work they way they want to use them.
Picture this. Guitar into AB box. On the A side are pedals. On the B side are different pedals.
But chain A and B terminate into a Y adapter at a single amp.
I'm thinking that once you make that parallel connection at the amp, you are bridging the circuit. The guitar is not running through the other chain, but electrically, you just tapped the circuit which would then change the final signal to the amp.
Am I right?