Although, I've always had problems with my A/B box, it seems to take some of the power of the original signal...as in, I can plug the guitar directly in to one amp, and it sounds normal, but then I plug it into the A/B/Y and try to use two amps. When I switch to just A or B, the signal is weak as hell, like my battery in my guitar is almost dead. Even though both are brand new in the guitar and in the box.
~006