Turn audio input sound into color

Hello all,

I am currently having some major trouble attempting to turn input sound into color (using minim fft).

I am hoping to use bandpass filters to set three frequency ranges and then use the numbers that come out of the analysis of the audio input waves to determine the r,g,b fill values of a square.

(Also I am open to any other suggestions for ways to turn input audio into colors.)

Any help is MUCH appreciated! Thank you so much in advance! Cheers!

Katherine