I’m writing an iOS app in Swift (will also write a Mac version later) and would 
like to add pitch detection. Is there an open-source project that does 
frequency pitch detection? Would I use AVAudioSession to capture the audio, 
then drop down into CoreAudio to do the pitch detection?

In my initial research, I’ve learned there are many algorithms and ways to go 
about doing pitch detection - each having strengths and weaknesses. 

Can someone please point me in the best direction to get started?

Thanks,
-K
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