[Plextalk] music cd's and ptr2

Ok, for those who no and use ptr2, I have an idea a little bit what to look for when it comes to music cd's, as they say, it must be a cd that is intended for primery use in a cd recorder or have an audio logo or something. The examples plextalk give on their site and the help I got in their emails didn't help me enough in this matter, could anyone give me more of a clear idea what to look for? What must be rittin on the packaging of such cd's? Ptr2 won't except recording of music cd format (digital audio) on a normal data cd, and I need to no what to look for in order to find the correct type of disk. I no that amazon also sold some of them, but that won't help me as i'm not in the US. Any ideas?