I was trying to remember where I picked up a few - Thankx filmy - shoulda known that one - duh!.
The sound forge update pages list a link to the mirror test tones. Sound forge xp used to feature a link to a bunch of audio files on SOFO's ftp site including test tones - not sure if they're still there, but I *Think* I remember them as being slightly different.
Otherwise, c-media has some for download I believe for checking out their multi channel cards/chips, Creative includes them with their drivers, I've come across audio prog. that create them, MS has a bunch of wav's, but no test tones I think at http://dgl.microsoft.com/default.asp?tPhrase=sounds, or go here: http://www.tmenet.com/rstcd.htm
It's not entirely free (although not expensive).
If you do a print to tape from the Vegas timeline (on the tools menu, not the file/render variation) you get the option to cretate a colour bar and 1 khz testtone in front of you project. That should do it. Just capture the tone back into Vegas and you got it.
Tor