hey all, i dont really know much about amp setup and all that, even though ive been playing for about 15 years, ive just been a bedroom guitarist and the occasional jam seshes at my drummer cousins place. ive got a few basic questions that need answers. first of all, is a line out the same as a preamp out jack? for example my marshall valvestate 65r combo has a line out, and i know its a solid state poweramp, with a valve preamp, so if i use the line out is it only using the preamp? or is there a difference? also the marshall has an FX loop but when i try to run a pedal through it it sounds kind of muffled and has no power, ive checked my leads and mucked around with the amp settings FX volume and all that. but really its just $*^t, compared to running the pedal into the guitar input. also ive got a chinese Biyang BY 2203 50watt amp which is a copy of the marshall JCM800 2203, which is a F'ing awsome amp for the price. it has an FX loop too and when i try run a pedal through that its kinda the same as the marshall vs65r, just $*^t, and when i try turn up the master volume it just has no power, and sounds muffled, even though i have the gain turned down i can tell its running through the gain channel but sounds $*^t compared to when i run it through the guitar input. i cant understand why anyone would want to use an effects loop if thats the results. i think i must be doing somthing wrong, can somwon shed some light on the situation? also i read some reviews on the marshall 2203, and there was some talk about using an attenuator with them, i couldnt figure out what they were talking about, whats an attenuator and what does it do? id appreciate any help you can give me.