hello damien
2 things:
1. you sed something about recording the same rithem in various speeds... here is a suggestion: why dont you change the frequency of the same drum loop throo out the game, there is a frequency flag in com audio, that lets you do that
you can try playing with it, and as levels progress, you raze the frequency...
that will save you alot of work, what more, you wont have to have different files for the same loop and you'll be able to save alot of space.
2. didn't you say you had a website, I mean, the better thing is to put the file in your ftp and give your beta testors the link... rather than doing all this skype work(totaly not professional)
best regards
http://www.lighttechinteractive.com