I rip mine the same way and have always been including the track numbers at the begining of the filename in %02 format so they would always sort fine in the OS. But on the empeg and in Jemplode, they would go back to alphabetical. Jemplode doesn't seem to care about the filenames, it cares about the song name in the id3 tag. The most certain way to get to get it right is to modify the song name in the id3 tag to begin with the track number. Kind of like the filename.