I have read a good bit of lit. regarding recording electric guitars but I still have a couple of questions. How important is it to put the cab in iso when you are using an SM57 close to the grill? My chain is Diezel -> SM57(bout 3 inches off the grill) -> Sebatron Thorax -> Kinda crappy A/D converters. Something is killing all the presence of the guitar sound.....it sounds pushed back and just kinda dull overall as if its missing something in the upper mids or highs. I moved the mic everywhere and that was the best position I found. Also I cranked different combination of trebel mids and presence on the amp but that just seemed to make it fizzy. Im looking for something with a very biting edge on it which is easily available from the source, but just isnt making it to the DAW. Any ideas? Would a clip help?