I'm not sure what the business relationship is here... but if you are talking about a library or "non profit" archive, emphasize that and people may start to get cooperative. I can see involving the EE department of you local University. Sounds like a good lab project for them, maybe even a graduate thesis. They probably have some sort of precise signal generator, or if not, find your local rep for HP/Agilent, etc and see if you can loan you/the college a piece of demo hardware for a few days. I'm kind of out the loop on these modern test instruments, but I expect you can program them to put out some specific signal like 1V at 10hz, and it will do exactly that, and then whip through some sort of programmed cycle to 100khz. "Sound" is just a signal with a wavelength in the audible range. Standard engineering practices apply.
Once you do this work for a non-profit, and let them benefit by making an appropriate buying decision (they buy the $100 one), it's legitimate to take what you have learned and present that data in a profitable situation (you convince them to buy the $100k one).