Hi Richard, I own his father: the GL 2. Same specs. I have it set up as you described: 3 stereo efx on its (pre fader) aux coming back through 6 channels bus 1/2 and 3/4 go to the repeater great sound and great flexibility. less headroom than on a mackie, unfortunately, but its filters are gorgeous. no problems after 2 years of use (it was bought 2nd hand). have fun