I recently took the HD-DVD plunge. I have an older receiver that supports 5.1 and DTS. I'm using optical digital out from my Toshiba HD-A2. Some of the newer HD disks are outputting newer formats like TrueHD that I assume are not supported by my receiver. I've not compared all of the audio options on some of those movies yet, but do get audio from all that I recall testing. Should I just be selecting 5.1 or DTS until I end up with a receiver or processor that understands the newer formats?