Any suggestions in how to market this unique sound board app with over 450 sounds?
Here's the link.
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http://www.facebook.com/pages/Martinez-Bros/159147347494653

Besides garnering interest from friends, you are probably going to have a hard time marketing this app. Sound apps are usually the sort of apps that you just upload to the app store and they either get a lot of downloads or they fail completely.

If you are really dedicated, try spreading the message that your soundboard app is the best, and you wont ever need to download another one again. Because honestly, I've never seen a soundboard with that many sounds :) Use twitter and tell your friends to help you spread the word. I'd also suggest removing that youtube video you have there and replace it with a less revealing demo. If people can hear all the sounds in the video, they wont be as excited to download your app.

That's just my two cents...