IPod nano's audio fried when USB connecter touched car charge power

In my car, I have a splitter for the "cigarette lighter" power, with two holes facing up.  There is no aux jack on the car's radio, so I also have a little radio transmitter, and it gets power from that splitter.  An audio cable connects the output of my iPod nano to the audio input of the radio transmitter.  My nano had a 30-pin cable connected to it, too.
One of the "cigarette ligher" power splitter's power locations was empty, just a hole facing up.  The power splitter also has a couple of USB ports, and I was in the process of attaching my nano with the 30-pin cable into that USB port for power.  Unfortunately, the USB connector touched inside the power hole.
So the nano got some voltage from the car battery and/or grounded things in a weird way through the audio of the radio transmitter (connected to the car's power) and the USB end of the 30-pin cable touching the car's power.
The nano's screen froze, and it didn't respond to any button presses.  So I figured it was totally fried, but it's not.  Once the battery ran down, I could connect it to my Mac, and now everything but the audio is working okay.  Through the 30-pin USB connection, I can load up songs from the Mac and play music out of a clock radio.
The probablem I'm writing about is that the sound coming out of the headphones is either non-existant or extremely garbled, depending on the volume level.  It's fried.  Can anybody give me some hope for un-frying the audio?

OK, so here is my problem.  I did originally download the Beta 10.10...  Apparently I kept on getting betas and was running 10.10.2 (which today is still in beta).
I did downgrade to 10.10.1 (by clicking "Download" in the App Store).
Right after the downgrade everything with syncing works perfectly.
Cheers, hope this helps someone.

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