I found this the other day when I was looking for some test tones. You can either download the wav/mp3 files or the program at the bottom of the page (Burninwave Generator): http://www.burninwave.com/
You can use these files with the jDFT-2 free RTA software: http://www.e.kth.se/~johk/jdft/index.html
Hope this is useful to someone

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