As I understand it from looking through the manual, the Audi MMI system doesn't support lossless audio encoding (ALAC or FLAC). Currently, all the music on my iMac is ripped in ALAC format into iTunes, so cannot be copied to an SD card for use in the car. Is there any solution to this ? Re-ripping everything to AAC is not an option, as the same music library is for home use too, nor do I want to have a duplicate of every file already ripped.
It seems odd that Audi have chosen to only support lossy formats, given that they are far more computationally intensive than lossless coding.