I am trying to create an audio watermarking system. I figure the best solution is to create an audio file (WAV) based on a unique string of text and then combine this with the original wav.

The part that makes this tricky (for me anyway) is:

• How do I convert the text string to a wav?
• How do I ensure that the resulting WAV form is inaudible (or at least barely noticeable to the listener).

I would prefer this be done server side (via PHP, etc) but if the processing load isn't too much then would be ok with something in Flash or Javascript.

I'd be willing to pay someone to create me a workable solution (complete source code that functions as described).

Thanks, Scott!