Responding to frequency recorded by microphone

Hi,
First of all - I have no idea what I'm doing. Sorry if this is the wrong place to be asking for help.
I want to know how to make an app that responds in real-time to the audio levels detected by the iPhone/iPad's microphone.
In particular, I want to make an app that counts up every time I make a sharp, sudden noise. For example a clap or a click of my finger and thumb.
I've experimented with my phone's microphone and those sounds are very obvious in a quiet environment.
It's clear from the audio wave that there are distinctive, sharp increases in volume. I want my app to count up one, every time the microphone detects these sharp increases. From my hours spent googling my problems, I've discovered that I can use FFT to measure audio frequency. I've downloaded aurioTouch
and tried it out but I don't know how to incorporate it into my idea.
Any help is appreciated!

I think you want to focus on the increases in volume and forget about the frequency.

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