I apologize again for poking some fun at your duplicate post.
I cruised through the doc for X2 and I also do not see what key binding would activate the drop down for example Tracks, at the top of the Track Pane. Once the drop down is there, each option seems to have a shortcut key - hide a track etc., but I too wonder how one would get that Tracks drop down to occur without clicking on it with your mouse. I always just click on it with the mouse and to be honest, I just use the mouse for whatever else I am doing while there, since I already used it to open the drop down.
I have no intention at this time of the steep learning curve I would have at learning bunches of key bindings, and while there might be one to do that, I will likely not ever know it.
Back in 8.5.3, the key bindings were an art form, and watching an accomplished engineer buzz through them always amazed me.
Then again, I still think the 3 Stooges are pretty funny.
Good luck on your quest.
Bob Bone