I just discovered that Timeline Controller plugin allows to interpolate a value from a custom ease. So if you manually create a random/chaotic ease curve, you can display a random portion of it. Here is a demo:
https://www.dropbox.com/s/p0zps6uq2pbiau3/random_spectrum.c3p?dl=0
very interesting, i added 3 slider bars called SliderBarR, SliderBarG, sliderBarB
and changed your code line to control colors as:
"rgba(qarp(0,0,SliderBarR.Value,n), qarp(0,SliderBarG.Value,0,n), qarp(SliderBarB.Value,0,0,n), 100)"
but its possible to control height using sliders?
for example when i raise Red color slider, graph on right side (red) increase, but Green and Blue not?