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Control Panel +---Sounds and Audio Devices +---Audio "Sound and Playback Devices" Fast Track Pro Out 1/2 RealTek HD (or whatever onboard) Fast Track Pro Out 3/4How does the user select both 1/2 and 3/4 so sound goes out all channels (necessary for L&R amp 1 and L&R amp 2 ?There is currently no known solution. It seems to be a limitation.Workaround: connect the second amp to the headphone out on the front of the M-Audio Fast Track Pro. Make sure A/B button is OUT.