Hi,
If you set All Tracks for a Region in the Render Region Matrix,
then you can't remove tracks from the render with the ReaScript Lua Function reaper.SetRegionRenderMatrix
Here is a code snippet:
https://gist.github.com/X-Raym/4eb87...dbc8ed202d9cec
and here is a demo :
Thanks for your help on this, I am trying to make a set of RRM scripts.
Cheers !