an audio spectrum visualizer using FFT of a set of parametric filters on a log
sine sweep 20 - 22050 Hz, 2^15 samples. The resolution in the low end is low and
wavey. The result is normalized.

The filters:

//ini_filter(peak(dB), Freq(Hz), bandwidth(Hz), samplerate)

#declare band4000 = init_filter(+6, 4000, 520, sampleRate);
#declare band1000 = init_filter(+3, 1000, 520, sampleRate);
#declare band500 = init_filter(-9, 500, 100, sampleRate);
#declare band200 = init_filter(-5, 200, 150, sampleRate);

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