[gmabli]

This must be a stock answer that service people are told to give. I, too, was told that I should use only commercially made CD's in my system even though the COMAND manual has a lengthy description of how to properly burn CD's to use in the unit. I've requested that they provide me with commercially made MP3's to test the unit, but they know of no such thing (nor do I).
The problem here is that we're on untested ground. MP3 players in MB's are relatively new and the repair people haven't caught up with the technology (IMO). I had a tech ask me how many seconds were allowed between songs on a burned MP3 CD. For those of you who are not familiar with the technology, commercially made regular CD's (not MP3's) have a set number of seconds between songs and, if you burn your own regular CD's, you can adjust the time between songs. MP3 CD's are data disks with the time between songs determined by the system playing the CD. Their questions demonstrate an ignorance of the technology. Hopefully this will improve as in-dash MP3 players become more common in MB's. I also believe in the Tooth Fairy![:D]