Hi, I am not sure if this has been covered before and I am also not sure how exactly to word it, but I will try to explain. Lets say my amp has 1) a great clean channel or 2) it is a single channel amp and has a great overdrive tone, but I have a preamp pedal that offers either a great overdrive tone (1) or a greater clean tone (2) and I want to be able to switch between going into the front end of the amp or into the preamp that will be going in to the effects loop. Is there such a device? Am I just needing a standard AB box or something different? The other pedals in the chain will be placed according to the order that works naturally (OD/Boost into the preamp of either the amp or pedal, time based and reverb into the effects loop after preamp going into loop) (Edit) When I switch to the front end, I will want the preamp going into the loop to be switched off and no longer in the chain. So, I assume I need some sort of pedal looping system? Thanks!