OK, 2 things , #1 I do not see the mouse mode button in the toolbar

And then, #2 to enter the automation curve drawing mode, is a little confusing i have to double-click on the green volume line - which is what I managed to do - but the problem is adding points to the curve is a really slow process of many double-clicks which all have to be on the line. And actually I want to edit "object" volume curve, not the whole track. I can delete points, but adding points is really intense work. Is this intentionally hard to do ; because I'm doing volume curves the wrong way?

The manual states hotkey is CTRL-4 numpad-4 does nothing - that might just be causing poor learning experience.

(Oh BTW I am tone deaf, so not trying to actually learn to produce actual "music" with the tool, and have no music ability, although I can be taught.)