rhysduk, the best place for a question like this is in on one of the other boards .... probably Sound and Cutscenes in this case. Post it there - you have a much better chance of getting an answer. Don't post your email: questions are public and answers are public, that way everybody can benefit from the shared knowledge.
Use this thread to let us know how the mission is getting on, post new versions and respond to feedback.
If you know there is a particular problem with your mission, post a version that has the problem removed, or if the mission will at least function, tell us what the problem is so that we don't waste any time on it. By all means mention what it is and post a link to the question you posted on the appropriate board.
I don't know anything about sound so I can't help you with this, but good luck.