Whistle Blow

I purchased this app for my iPhone 6 Plus to help a young child do the HPVT. Every little sound in the room made the whistle go off. Blowing, however, did not.

Whistle starts and then won't stop no matter how many times you hit the silence button. I imagine that was meant as a joke??? Why is it no one can just make a simple app that will allow you to push a button and make a whistle sound that stops when you release the screen button??!!!

This app would be great if you had the option to turn off the "blow" choice as well... Just holding the phone caused it to constantly whistle, which wasn't helpful when using it to start a PE race! Even with the sensitivity bar, it was either all or nothing.