You can also use WireTap or some other system sound recording ap to just play the file and record it ... no need to burn as disc!
[url]http://www.ambrosiasw.com/utilities/wiretap/[/url]
I thought this used to be free ... maybe there's a demo or something you can use. If not, Ambrosia makes great software so it's worth the $$$ to support them ... :)
Or find somthing similar on versiontracker.com.