If you want to make sure you'll be ADA compliant, there's some information on creating an audio Turing test here. I responded to that thread at the bottom, but I'm not familiar with that message board and I might try creating a new thread that gets pushed to the top of the list where someone might actually see it.

UPDATE: See the replies I got here.

In reply to Re^3: Image Verification Program by Wassercrats
in thread Image Verification Program by peppiv

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