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The TPMC-4SM (and TPCS-4SM, not sure about the "D" version, though) do via the System3 Reserved Joins device extender with an analog value for each button (0 - off, 1 - green, 2 - red, IIRC)

Beware, though, I'm not sure why but changing the backlight color seems to be a particularly intensive task, especially on the TPCS. Depending on what else the touchpanel is doing at the moment it can range from "slight lag" to "OMG, it's not working! <beat> Oh, wait, there it goes!"

Needless to say, I have not found acceptable results with trying to use the backlight color as a "Yes, you pressed me!" indication. I have, however, in a few projects used it to indicate things like audio and video mute status. But again, be ware of the hardware limitations: I generally prefer to make mute buttons "blink" (driven by a common 0.5s/0.5s OSC) so they jump out at the user, this does not work well on the TP**-4SM family.

On the TPMC-4SM doing this tends to get the panel farther and farther behind so that after a few seconds the panel is so far behind that the observed blink rate is more like 1.0s/1.0s -- and the worst part is that it queues them up, so the button will continue to blink well after it's no longer being told to blink by the program.

So, in other words, don't try changing the color too frequently :)

--
Lincoln King-Cliby, CTS
Sr. Systems Architect | Crestron Certified Master Programmer (Silver)
ControlWorks Consulting, LLC
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Crestron Authorized Independent Programmer