I can’t answer questions about the JAM because I resorted to finding a spare Clip Zip and a Clip +. I only use them for audiobooks and the forums seem to indicate the new ones don’t handle the audiobooks as well as the older models. I went to e-bay and found both new and refurbished Zips. They are more expensive than they used to be (I really loved that $40 price tag) but my refurbished has kept running almost as long as the last new one I had, praying it keeps working. Remember, with the sd card you don’t have to have the biggest built in memory to get good bang for your buck.
If you check the forums on the JAM or the Sport, they should let you know about the AAC support. The forum guys are awesome here.
