Dawg: For the audio streams check out: http://www.geekzone.co.nz/forums.asp?ForumId=88&TopicId=20548&page_no=2Even though its been requested in the past, I definitely advise people to push them on it - otherwise it could easily be forgotten about, or give the change a very low priority. The more people asking for HE-AAC support the better.
I believe they are looking at a June firmware release to fix the problem. lchiu7 has been pushing for the audio support on the NMT forums.