Hello, I'm new here (as well as to linux) and have the same exact problem the original poster had. I've managed to figure out how to get to the /etc/bluetooth folder but I don't see the audio.service file. The files that I find are the following:

audio.conf
hcid.conf
input.service
network.service
serial.service

Where is the audio.service file? If it makes any difference, I have an N810 wimax running the latest diablo, bluetooth turned on, no fm radio, and no a2dp.

Also, how would I go about changing the autostart attribute to true? Keep in mind this is the second day that I've started looking at linux.