Additionally, adding the Dolby 3 Stereo and Bypass modes cutoff the sound to the rear channel and recognizing the the DPL option reduces the volume on both front and rear channels.. again, highly appreciated, especially since previously I have a four port A-B-C-D switch box, which I had to discard, due to some new speakers I got for my front channel, that required me to configure as a pass-through. Now, my life is complete again.. didn’t want to part having music outside/patio. Best, David