This problem is very intermittant and while Torre (with all due respect) thinks fooling with the fuses fixed his car, it is very likely that the problem has temporarily went away and it is just coincidental that it is working again after he worked on the fuses.
More than likely, it began working again just like they all seem to do after sitting awhile.
I had two 2009 Gennys. The first one was plaqued with the sound problems. As many here can attest, other problem occured as well and these "other" problems caused the mechanics to chase these as well, and the "other" problems changed with each malfunction. It wasted a lot of time too.
For instance, the first time it malfunctioned (Oct 2008) happened after a rain. No sound, no voice command, no warning chimes from the parking assist, no steering
wheel button response. Now I had complained that they had drilled all these unnecessary holes in the front bumper when putting on a front dealer tag...hmmm, 10 holes in the bumper, rain, no warning noise from parking assist...did that cause an electiical problem? They decided no, but found some loose wiring in the steering column, fixed that, radio worked and they think problem solved. By the way, the fuses were the first thing they suspected-wasn't it.
Problem reoccurs. Minor differences...this time DIS knob is useless and no numbers appear on the AM/FM screen (as far as tuning a station). This causes them to try to chase down problems with the DIS knob. Other times it had some weird message on the screen. The only common thing was the sound never worked, the other issues changed constantly with each malfunction.
They would work on it, and since the problem came and went, they would think they fixed it and call me to come get the car. One time they called me saying it was fixed and I drove over there only to leave because when they were getting the car out of the shop, it stopped working again.
If you're still reading-I always had a loaner to drive, but I only owned the car a month and they had it three weeks and I refused to take it back. They switched me out of that Genny into an identical one...within four days, same problem.
They had changed the head unit out on the first Genny for a brand new one and it didn't work. This time they sent a new head unit and a new amp. The head unit was installed, but not the amp. I was told that the amp looked different from the original equipment and they thought it was a mistake so didn't install it. When the sound went out again, the dealership was told to put in that amp and the car never malfunctioned again as long as I had it.
And by the way, I always had XM, so it wasn't that.
The dealer always tried to work with me, was just as frustrated as I was, and they went to bat for me when it came to the car change out.
NOLa
One more thing for Torre...if I am reading you right, you don't like the air coming into your car and press recirculate to stop it? If that's what you meant, the fresh air is a safety issue. Recirculate mode is not meant to be on all the time. The car (and every car) vents fresh air into the cabin usually through the two outer vents by the windows. Riding with recirculate on lessens fresh air in the cabin and will make you sleepy. Just point the offending vents away. I would imagine that is why the cars default mode is fresh air mode.
but this thing with the audio (mostly) and the steering 
