Well, on the PS3, when you put a DVD-A disk in, it shows 2 disks available,
1 labelled 'CD', and the other 'Multi-channel audio'. The latter lights up the nultichannel lights on my rcvr and says 3/2.1 and I have descrete sound from the back channels. That is alot more than a 2 channel output.
Are you saying there is another track on those disks ABOVE the DD 3/2.1?
Don't know what discs you're talking about, but if it's a DVD-A disc, there should also be an "Advanced Resolution" tracks, whether surround sound or stereo. If your player isn't capable of playing them, they won't even show up in the menus.
The "Fragile" DVD-A disc does have a DTS mix on it, as well as Dolby Digital. If your player doesn't support DVD-A, they will be the only surround sound tracks you'll be able to play.
I have the "Fragile" DVD-A also. On the back, it lists what is on it. Here's what it says:
Advanced Resolution Surround Sound (96kHz/24-bit)........DVD-Audio players
Advanced Resolution Stereo (192kHz/24-bit).....................DVD-Audio players
Dolby Digital & DTS 5.1 Surround Sound.............................DVD-Video players
Photo Gallery......................................................................All DVD players
Lyrics...................................................................................All DVD players
Animated Yes Timeline.........................................................All DVD players
The "Advanced Resolution" mixes are the DVD-A mixes.
PS3 doesn't play DVD-A Advanced Resolution mix.
I've heard that they'll play SACD, but it may be downmixed to stereo, because I don't think they're allowed to play the hi res surround mix over HDMI. But I may be wrong on that. Seems like that's what I've heard though.