Attached is a PD/Gem patch similar to the one Chris presented in class: the center frequency of a filter used as an RGB color gradient.  Here I reused our PD_tutorial "filter bank" (see the subpatch [pd filters]) and just passed the frequency values along to color values for 4 squares placed in the 4 corners of the Gem window (using [translateXYZ] as discussed in lecture).

Open the patch, "create" a Gem window and click the big green toggle.  Note that I am using Chris's mechanism exactly, the [metro] object (metronome) which sends a bang every 4 seconds to a random number generator, triggering one of the filter chords.

Attachment	Size
4_squares.pd	6.82 KB