I found this great tip in the Apple forums from Mike Cidras. To change the default volume changing sound in 10.2 (it's a muted 'click' of sorts), you need to replace one file. The file to be replaced is volume.aiff, and it's located in /System -> Library -> LoginPlugins -> BezelServices.loginPlugin -> Contents -> Resources. Find a nice AIFF file that you'd rather use, and replace the original with your new version (you might want to make a backup first). You'll need to be root (or use sudo) to do this, as the directory is owned by root. Here's an example:
This switch also eliminated the annoying lag I was getting when changing volumes.
% sudo cp /System/Library/Sounds/Sosumi.aiff \[Shown on three lines with continuation characters, but enter it on one line if it gives you any problems; remember the space after the "Sosumi.aiff!"]
/System/Library/LoginPlugins/BezelServices.loginPlugin/\
Contents/Resources/volume.aiff
This switch also eliminated the annoying lag I was getting when changing volumes.
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