Current List of Variables

I am aware of Variables - Cantabile - Software for Performing Musicians but I don’t think it is up-to-date?

I am trying to build a simple “mixer” on the controller bar. not technically a mixer as it doesn’t interact with audio at all, It simply sets the output gain of various racks and the master output gain.

This is working. The buttons are bound to rack gain. I have 7 knobs on my controller also bound the same way. I can turn the physical knobs or drag the controller bar popup and it all works. The master caption is connected to $(MasterOutputGain) and displays the actual dB value live. Which is nice. $(MasterOutputGain) is not in the official variable list. Which leads to my question about a more current list.

My hope is that there is a variable that will give me the output gain of a particular rack