OHHHHH, I get it. Ok, I actually have a bat file for that; so what I"ll be doing is running VAC: mic to 1, 1 to 3, 2 to 3, 2 to phones. So then, I'd have to set up I think 3 for mic in on that third screenshot you showed. Then, I get only the caller's audio coming in and I presume I'd still hear music/sound effects. I'll try that and update.
UPDATE: Ok, tried 1, 2, and 3 for input with above setup, with both output to encoders only selection on and off, and anytime I can get my voice to broadcast, I hear it back through my phones. I have not been able to broadcast my voice at all without mic button pressed, so I have not even tested calls. In theory, if line 3 is my input, and it has MIC coming to it, and LINE TWO coming to it (if Skype/GV outputs to TWO) then I have my repeaters for LINE TWO to phones, shouldn't I only hear caller and presumably music/sound files?
UPDATE: seem to have it working but with drawbacks. Changed repeater setup to: mic to 1, 2 to 1, 2 to headset, Google voice to Line 2, then set RB to Line 1 input. Now, I can make/receive calls and broadcast, but cannot see mic input register on the meter which I rely on to make sure I haven't disconnected or something during shows (it still works with music and such, just not mic input). So it's all working, no echo, but now no meter. Ugh, better tho.