The AudioTron does not support AAC, MP4, Ogg Vorbis or any lossless
Regarding "iTunes music store" material, even if a device had AAC support, it
still couldn't play even one of those 100M iTunes music store songs. Fairplay
DRM is Apple proprietary and they haven't opened it up to third parties.
Apple software and hardware can play fairplay/AAC songs. Nothing else can.
Please note that iTunes at present is not available outside the USA.
This is the message you receive if you attempt to use it from abroad:
"The iTunes Music Store is not available in your country yet.
You will be able to browse music and listen to previews, but
you won't be able to purchase music unless your billing address
is in the United States."