Using gwoptics to plot a frequency time / amplitude time graph.

Hey, I was wondering if there was any way using gwoptics, and minim or any other graphing library to make a frequency time / amplitude time graph of a given audio track. Although this is my main question, it'd be great if someone could tell me how to find the local maxima and minima, i.e derivative of the resultant graph.

Thanks in advance,

Epiclapser

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