I do not have access to NASA, they are hundreds of miles South of me, I paid a contractor as a go between.
If that contact did not exist, I would try the place near Chicago. Address posted above here (12-15-02). Results from them was good, just had a bad experience as it was one of the two transformer experiments that took ETERNITY to break in.
Other than that, several people have mentioned Jena Labs, so I assume they are the "buzz" place of the moment. If they are immersion cryo, they are using the correct form of cryo.
As for sound, anything I have ever had cryo treated sounded worse than before, until break in period was complete.