Here is a short video on the TC Electronic Nova System, explaining the differences between using it front of an amp, or in the loop. I get asked this question quite a lot, so I thought I would put together a little video explaining the differences between each, but at the end of day, it comes down to you as a player and the sound you are after as to where you place it. Or you could just get two Nova Systems, as I mentioned in this post and it is still cheaper that a G-System! PeaceNeil