I'm having some trouble with my Audio 4. I know both Channel A and B work since I can test the functionality using Window's 'sound test', but Ableton is only sending sound out through channel A.
I have my driver set up:
http://i.imgur.com/ccXfZWE.png
http://i.imgur.com/tzjTAun.png
http://i.imgur.com/Mvcd3jC.png