Carl,This is a fine concept. However, many times the different character modes can produce curious results. I tried adding some modes to the define part of the text sample, and it seems to work. However, the undefined reference modes and the defined modes should all be visible to have a panoptic view.
Best, Kari
Here's an XPL program that shows the effect of changing the value of DD on the color of defined text: https://ammaze.net/xywwweb/dls/TESTDD.ZIP Command RUN TESTDD.PM and use the left and right arrow keys to increment|decrement the value of DD.