I remember seeing ONE person who had done it with a hasbro board, but I don't remember for sure. US does not do sound installs on V2 hilts though, so you would have to do it yourself or have an electronics minded friend do it for you. But it is possible, if very difficult, to get it in there. *runs off and does a thread search* Ahhh, here are some links you may find useful!
http://www.saberforum.com/index.php?topic=5025.0http://www.saberforum.com/index.php?topic=4369.0And if you use the forum search feature and type in 'V2 sound' you may find a couple more threads with information. You could also search 'econo sound' and 'hasbro sound' which both might bring up some helpful results.
