A while ago I spent ages putting all my audiobook Cd's into my iTunes. This involved joining the tracks and changing each track from M4a to M4b so it would play. It was a long job. Since then I have updated iTunes. Today I wanted to change the audiobook on my ipod but when I went into my iTunes the only audio books showing are the couple I have downloaded from the internet. I cannot find the books from my CD's. Has anybody any idea where I might find them?