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Pure Data: An open source visual programming language useful for sound synthesis and analysis: https://puredata.info

Cloud-based service for integrating interactive sound within unity:  https://enzienaudio.com

Magicolo: PureData Plug-In for Unity: https://github.com/Magicolo/uPD

Tutorial: How to use PureData for Unity: http://melodrive.com/blog/how-to-use-pure-data-in-unity/

Using Enzein’s Heavy to upload Pure Data patches to Unity: 

 

Unity Forum: Audio Analysis and Isolating Frequency values: https://answers.unity.com/questions/175173/audio-analysis-pass-filter.html