OK, I've just carried out a couple of experiments with a few MP3 tracks on an SD Card to see what data COMAND uses. First thing to say is that if you just bung in a card or a disc, my assumption that COMAND used the ID3 tags was incorrect: it ignores them completely and uses the MP3 filenames and the file system's Folder structure and names to segregate the files into albums. However, if you then use the search function to (for example) look for an album by name, you will receive a message: If you respond "Yes" to this, then COMAND does read the ID3 tags and it builds an index of the albums, artists and tracks from the tags. Subsequently, if you search for an album by name then COMAND will find the album for you and display the tracks in their normal order (assuming that the ID3 tags are correct). So in summary, if you want to navigate by the folders then the folder structure needs to be correct, i.e. Artist\Album, and the files themselves need to be named so that they sort into the track order expected. This normally means that the file names must include the track number at the front (use a 2-digit number, i.e. 01, 02, ... 11, 12 otherwise the tracks will sort 1, 11, 12, 2, 3, etc.). If you want to navigate by the Search function, then the ID3 tags need to be correct and they need to have been read in by COMAND first. If you're burning an MP3 CD from iTunes then
this Apple Knowledgebase article is worth reading.