Hi,
I'm sherif, a flash developer with 7 years experience, located in London, UK.
Here's a link to my portfolio [login to view URL], please also have a look at my reviews on here http://www.freelancer.com/u/lemoncurd.html.
I've created a quick example here [login to view URL] this is a proof of concept, we can adjust how sensitive the app is to the mic.
Let me know if you have any questions.
Regards,
Sherif