This is a live sound situation, but the same principles apply.... Hooked up a brand spankin' new - right outta the box - Allen & Heath GL2200 this evening. Ran the mixer output to the mains from the Mono out (XLR) of the board into the XLR input of a dbx266 (compressor) set at +4dbu and then fed the output of that into a return line down the snake and into the power amp input (XLR > 1/4" unbal - pins 2&3 tied together at 1/4" end). Signal was weak - VERY WEAK!!! Took the comp out of the loop by hooking the snake return line directly to the mixer Mono out (and also tried hooking to the XLR cable plugged into the Mono out) and the signal came to life. The difference is about 180 degrees on the Mono send level pot to get the same volume - really - and, there is some distortion there too with the comp in-line. OK - that makes absolutely no sense me whatsoever. I first had tried running thru a graphic which was 1/4", and it did the same thing so I thought something was up with the EQ (bal vs. unbal, etc.). But then I had the same deal with the compressor - so now I'm scratching my head.... The output level of the comp & the EQ were set to '0' (unity). I even tried using the 1/4" (bal) I/O of the dbx - no change....and bypassing the comp or EQ makes no difference. The comp has a switch for +4 or -10. Only difference is that when set to -10, the signal practically goes away. Anybody see what I'm overlooking? Thanks for the help.