I have Guitar Rig 3 and on a Mac with Snow Leopard. I'm using ALESIS MicLink - AudioLink Series XLR-to-USB Cable. I have a Denon receiver amp with an 1/8 stereo mini jack going into the speaker input in the back of my Mac and from there a split RCA jacks going into Out/Rec in the back of my Denon amp. (see attacht). I can't get any sound out even though I can see on the Jazz amp movement of sound coming in.
Back of Denon amp.jpg