I have an ipod nano 5th gen. I have a large audiobook whose structure is by track (ten of them) and within each track is a subtrack (chapters?, various number of them per track). I can edit the name to be shorter of the track but not able to shorten the subtrack/chapter name so it will fit well on the nano screen. I am a disabled guy just trying to make better use of a complex, protected AAC audiobook. Thank you.