And it's free! Plus Foobar can be extended so many different ways (playback/stream dvd-a isos and virtually any audio format is supported).
I heard no problem with 2-channel sources (96k/192k,16bit/24bit WAVs), but with 5.1-ch sources, even its HDMI out indicates 6-ch, I measured the Center always sends 0's, and the other 5 channels send out almost the same contents. Channel identification is lost I think.
Channel ID is in the LPCM header...I think that's where things are going awry for the -83. BTW, were you measuring the bitstream from HDMI? What's your speaker setup? How did a 5.0 and 5.1 file differ in sound?
Good to know this nice Foobar server, let Oppo know to fix this case.
You might want to email or call Oppo. Encouragement to fix a bug can never hurt the cause. And if the bug lingers...being that you're so close perhaps you could start hanging around the parking lot when engineers are leaving work (We could start a collection to pay for a picket sign)!