Kind of a two parter here. Has anyone actually noticed a difference in tone between the single channel m4 w/ fx loop and dual channel without? I recently purchased my first m4. It is a single channel and I've read that Bruce said taking out the fx loop improved the tone. Which leads me to my second question, what is the point of the loop on the first version of the m4 anyways. When you separate pre amp/power amp. Your effects loop is anything I between.