Tutorial: Visualise the frequencies of a signal in real time. Self build for my mac(macOS Catalina, MBP 16-inch, 2019).
https://docs.juce.com/master/tutorial_spectrum_analyser.html
//#include "SpectrumAnalyserTutorial_01.h"
#include "SpectrumAnalyserTutorial_02.h"
If your operating system requires you to request permission to access the microphone
(currently iOS, Android and macOS Mojave) then you will need to set the corresponding option
under the relevant exporter in the Projucer and resave the project.