Rapidshare (http://rapidshare.de) would work, you can upload the sound files to a free account with unlimited space and then as administrator you'll get an URL which is specific for each file, and that URL (the web address) could be posted here on the forum, then everyone who knows it can go in and ask for a download of the file (or an archive of files). This would work with short video clips too, and you don't have to state your real name and adress, they don't really control that, they do check that your VISA card is valid (if you go for a paid account to get better service) but that's about it, it's very secure.
Just state something that looks like your real name (same last name as on your visa card?) and a fake adress when regging an account (I twice used adresses in Germany, complete with zip code, culled from a travel guide to Cologne, though I've never lived in Germany)
Rapidshare have a limit for downloading in a free account that's 50 MB an hour and about 400 MB a day I think, so files bigger than 50 MB can be hard to handle if the downloader doesn't hold a pay account (about 10 euro per month). I know they're very open-minded about content, they just don't care if it's "adult", spanking or gives some people the nerves though they will act, deleting files and folders, if they are tipped off that copyrighted material [ripped music albums etc) have been uploaded and made accessible for free.