Understanding Boss GT5
I don't have the GT-5 - in fact, I've never used one - but I have the Roland GP-100, which is very similar in many repects (only it's a rack unit). With the GP-100, I have two loops with adjustable line levels, and the position of each loop in the effects chain is variable. So, I can put any pedal or group of pedals on each loop, and then specify where in the signal chain I want the the signal to go through the loop. I use a BOSS OS-2 in loop 1 to add some grist to my signal in a number of patches, and it's generally placed early in the signal chain, before the preamp, as if I had the OS-2 on the floor. I can engage or disengage the loop (and there by place the pedal in or out of the signal chain) with one of the pedals on my FC200 floor unit, which is assigned to the midi channel I assigned to the effects loop. *I don't know if the GT-5 has the same capability, but I've heard the units are very, very similar, so I would imagine that it would... I hope this helps.