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It wasn't easy to get it to make sound properly.. I had to clear out the inside of the whistle part, and shave of layers above the rectangle hole so that it would vibrate the air properly.

I soldered all the parts together. I think having the whistle part attached in part 4 would be easier.

Here's a video of it in action: http://www.facebook.com/photo.php?v=10151334052671601http://www.facebook.com/photo....