I am introducing a compressor-limiter into my setup. (The mixer/soundcard setup has worked all along.) When I speak into a mic (that is going in through the mixer); I get levels on both the mixer and the compressor. But, whether hearing the mic live or playing back on a Cakewalk track, I don't hear any difference in sound from moving around the knobs on the compressor. Also, on the mixer, if I change the up/down positions of the tape to control room and/or tape to mix buttons - there is still no change from the compressor. Moving the Aux Return knob also doesn't change the sound. I am wondering if I have everything configured right, or if there is something else I should be doing differently in the setup loop. (i.e. maybe move around the setup chain). Thanks for any help. =============================================== Here is what I have: Behringer UB802 mixer http://www.behringer.com/UB802/index.cfm?lang=ENG Behringer AUTOCOM PRO MDX1400 2-Channel Compressor/Limiter http://www.behringer.com/MDX1400/index.cfm?lang=ENG Santa Cruz soundcard http://www.turtlebeach.com/site/products/soundcards/santacruz/indetail.asp -cable(1): two left and right rca plugs one side, two left and right 1/4" plugs other side -cable(2): two left and right rca plugs one side, one 1/8" plug other side -cable(3): insert/fx cable- two 1/4" plugs one side, one 1/4" plug other side -adapters: 1/8"-to-1/4" and 1/4"-to-1/8" My current configuration is: Using cable(1): L and R rca/tape-outs on mixer to line-in on soundcard (using a 1/4" to 1/8" adapter on just the left 1/4" plug) Using cable(2): Line out 1/8" on soundcard to L and R/rca tape-ins on mixer Using cable(3): One plug in output on compressor, other plug (on same side of cable) in input of mixer. The other side of the cable (single plug) is going into "FX Send".