I'm thinking of a different approach to this feature where The Lighting Controller 'owns' the button state, and after The Lighting Controller changes a button state, it ‘tells’ VDJ that state using the OS2L feedback protocol.
Thanks for the quick reply! I found some additional information that may be helpful.
While I was trying to figure out how to get this to work, I read about a similar feature in this thread: https://www.virtualdj.com/wiki/OS2L_SunliteSuite2.html
When I looked at the OS2L web page a second time ...