Grundig Xenaro 5100: MPEG5.1, audio track switch?

[inliner]

I'm currently searching for a new player with especially SVCD and MP3 support. I stumbled over the above mentioned Grundig model which according to the database here is said to handle audio tracks (a must for me) and subs. In the shop where I tried one, I couldn't find a key on the remote to switch tracks or the subtitles. Can anyone tell me how that's done?
Furthermore one user reports the player to handle (I think that means output digitally) MPEG5.1. Can anyone confirm this? Or know of other players that can do that?
Thanks for any input, as I'm still looking for a good player, that can do (play) nearly all 8)

Greetings from Germany... Dietmar

[inliner]

Has noone any information about this player, because the info in the database here is quite contradictionary