Paul 

use audio signal (Hz/Sample) to trigger a RGB colour rectangle (varying dimensions)

apply random RGB colour within a range, add gradient (?)

objective:
use audio signal (Hz/Sample) to trigger a RGB colour rectangle (varying dimensions)
apply random RGB colour within a range, add gradient (?)

any pointers much appreciated : )

objective:
use audio signal (Hz/Sample) to trigger a RGB colour rectangle (varying dimensions)
apply random RGB colour within a range, add ... 

audio signal triggers a shape with rgb ref