@Heidi > The CDJ-350's cannot connect to a computer to access Rekordbox. The Pro DJ LINK feature is needed on the CDJ's in order to do this. i.e. the CDJ-900's and CDJ-2000's only
If you would like to use Rekordbox analyzed files with your CDJ-350's, you will need to export the tracks from Rekordbox to a USB device, and connect it to the top of the CDJ-350.