Useful Observation: Buttons, lights and Actions (can't be 100%, but it seems to hold true for all the Actions I've tried)
In the Action list, any Action that has an entry in the Status column will send correct on/off feedback to a CSI surface Button (ie FB_TwoState). If there isn't an entry in the Status column, it won't and the the light will be on permanently.
So even if it has Toggle in the name, if there's no Status column entry, there'll be no feedback to the light.
Useless observation:
Reaper can do RadioButtons by itself when it wants to. I mapped the grid divisions to four FB_TwoState MCU Buttons (Actions 40781, 40780, 40779, 40778)
The Grid obviously can't be set to Bars and Quarter notes simultaneously, but the surprise was that it turns out one grid button light when another grid button is selected.
I guess this happens so that on screen icons for the same functions will light and extinguish appropriately.
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