Forcing User Sound Preferences

I'm getting my lab of 1st generation Intel iMacs ready for online oral language exams. It's mostly going well, but I'm having trouble forcing sound preferences so that a user can plug in a USB headset, power on, log in, and NOT have to open the Sound pane in System Preferences. I'd like the input and output device to default to the USB headset, and I'd like to set standard input and output volume settings.
As it is, as often as not, when a student logs in, even though the USB headset is already attached, sound input and output default to the built-in microphone and speakers, and volume is not consistent.
It appears that the relevant settings are spread across several plist files, some local and some in home directories. I've tried putting standard copies of com.apple.finder.plist and com.apple.systempreferences.plist in user ∼/Library/Preferences/ folders, with only limited success.
Any suggestions?

Unfortunately, not all accounts are local and kept in System Preferences>Accounts. So far the only way I've been able to flush accounts was to delete their respective User folders.
I've done some more searching and I've seen my question asked before but never answered.

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    Dalton
    ===============================================================
    Dalton Cranston 45 Castle St.,
    GO5 Ltd Reading. RG1 7SN
    E-mail: [email protected] United Kingdom
    URL: www.go5.com Phone: +44 (0)1189 589 555
    Fax: +44 (0)1189 587 467
    -----Original Message-----
    From: Lu Wang X1 [SMTP:[email protected]]
    Sent: 13 February 1998 17:45
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