Copy pattern settings specifics

When you do [PROJECT] + [SHIFT] + [SHIFT] to activate copy pattern settings, what exactly is it copying? I know copy pattern is copying the entire pattern, and copy track is copying a track’s sequencer as well as its plug-in settings. Does copy pattern settings only copy the mixer levels, or all parameters of all tracks?

All parameters of all tracks. It’s useful for when you have multiple patterns that are identical and you need to update the mix or settings on both of them