I haven't tried using my USP in bypass mode. The UMC has multiple trigger outputs (4 of them) which can be configured for each of your devices (Oppo, CD, TV ect.), so you can set your inputs (in the UMC setup) to trigger specific amps depending on whether you are listening to music vs. using the HT. To give an example, you could set up an input (maybe labeled audio)for listening to music that only turns on the amps for your L/R and a separate input (say theater) for turning all of them on for movies. I only have one amp in the HT, so I'm not taking advantage of that feature, but if I had multiple amps, it would definately be convenient. Like I said, I'm not 100% sure this is possible with the USP involved, but it should be. You might want to post the question on the Emotiva boards and specifically ask those using both to chime in. Better yet, call customer service and ask directly. It will most likely get you a quicker and more accurate response. Sorry I can't be more help.