I only ever use effects loops for things like chorus, flange, phazer, and all modulation pedals, I also mainly use an effects loop for echo, delays and reverbs, as it normally sounds purer and cleaner. Your amp is an absolute classic so even if you dont use the loop, it'll still sound amazing. As far as I know there's a way that a Vox AC30 can get effects in sterio! like sterio delay and modulations ect. I dont know much about that though, can anyone else help on that matter. I have a freind who manages to get a really nice sterio sound out of his Vox AC30, he uses the memory man deluxe delay/chorus pedal by electro harmonix, same as 'the edge' from U2.