Back about a year ago, I looked into a means to enjoy 5.1 from what might be out there in addition to SACD. The only thing I came up with was Acoustic Sounds has some 5.1 music downloads in FLAC and DSD. I bought a few. I could not get them to play in 5.1 from my laptop through any program via usb to my OPPO. I was able to enjoy in stereo but not gaplessly. I ended up copying the downloads to a thumb drive, which, when inserted into the OPPO's front usb port, did permit gapless multi-channel playback. One of the downloads, a version of The Firebird played by the Seattle Symphony sounded really nice but I found overall these downloads are too much of a hassle. Plus, I don't think I can trade em or sell them like I can SACDs. At any rate, I have not had any more interest in exploration of multi-channel streams or downloads. I'm just hoping one day I might be able to get multi-channel from iTunes which now gets me stereo without hassle.