Dear Mark,
I purchased a cable with two mini-jack plugs (mono) on each end, so it should have the same polarity each side. I just want the G55 amp to switch on/off when I do the same with the G68. If what the manual says (which is very little) it should work without any tweaking. I did however try the high/low setting (properties of the G68 device on the setup program)and didn't work. And I can not see any other option anywhere.
MRC, and speaker configuration with the DBmeter and A(8) port work just fine, as well as anything else tried including the phantom device for the sacd.
Costas