ofSoundGetSpectrum max value

Hi! I should want to extract the max value of bands of mp3 song. I have seen that ofSoundGetSpectrum is something like to this , but it needs to play a song , I search one clearly function that create a spectrum of entire song and give a max value for each bands. I have tried with aubio but I have had many problems on its installation so I have installed ofxMaxim and ofxFft but there isn’t a documentation for these so I don’t understand which function to use and in which way.

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