Just to be clear the tour unit does not, nor will not, have the adjustable impedance feature. Right?
Actually, when it gets back on the road it will indeed have adjustable impedance. I'm going to set up 4 levels in addition to the default 20k (which is 40k balanced). Probably 2k, 5k, 25k and 50k which is 4k, 10k, 50k, and 100k balanced.