Line out and Sound Effects revert to Internal Speakers when I reboot. Any suggestions?

I have an early 2008 Mac Pro that runs fine under Yosemite. The Sound preference panel worked under Mavericks, but now I must open the Sound panel and manually change the output for both Output and Sound Effects from Internal Speakers to Line Out after a reboot. This is irritating and is becoming more so.
I've zapped the PRAM with no success.
Would an AppleScript app on startup work? I can't seem to find any appropriate commands in AppleScript that affect these parameters.
Any help appreciated.

The script doesn't seem to work on Yosemite. Trolling around in the library, it appears that "audio" is now "sound," which would explain the file not found.
Or am I missing something?
Suggestions?

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