beep on dvd studio pro even or on drive open....?

ok so i’m trying to develop a scrip to easily burn mass copies of a dvd using dvd studio pro, actually its so when i have to step out of the office, those that remain that have NO dvd studio pro experience can continue duplicating for me… this is what i have so far and it seems to work.

display dialog "Ready to Burn copy?" buttons {"Yes", "No"} default button 1 with icon caution
if button returned of result is "Yes" then tell application "DVD Studio Pro"
end tell

tell application "System Events"
	delay 0.1
	keystroke return
	keystroke "b" using {command down, option down}
end tell

and i have that script set to run whenever a blank DVD is inserted… that seems to work well… my only problem is that when it finishes burning the drive pops open so quietly people tend to miss it… so im wondering if theres a way to make my mac beep on either the drive opening or when dvd studio displays the dialog that the formatting is finished…

sorry if this is posted in the wrong spot wasn’t sure where to put it…

thanks in advance

Model: mac pro
AppleScript: 2.3
Browser: Safari 531.21.10
Operating System: Mac OS X (10.6)