Apologies if this has been asked before but I wonder if anyone knows if there are settings on the 502 so that it can be used in a home theatre bypass mode? I want to keep the 502/557 separate for stereo music but be able to utilise them from the front pre outs on an A/V amp to drive the stereo speakers as front left/right speakers in a 5.1 surround set up as well, with the A/V amp then controlling volume if watching a film: is this possible to do on the 502?