Help with Leon CD system

[crashavoidance]

I have recently purchased a new Leon Stylance however it says that the CD system I have a single changer is compatible with mp3 cd's however no matter what sort I try to create they do not seem to work. I have even tried mp3 cds that other people use in their cars and they do not work either.

Does anyone have any advice on what I should be doing to get this sorted correctly??

Thanks in advance