Suggestion: Use the "Eye" icon for track visibility in Timeline, instead of the "Film" icon.

Rationale behind the suggestion: 
- The "eye" is a standard visibility icon used in (other software, and) other places of the UI, like effects to control visibility, so it would be good for UI discoverability (i.e. new users) and consistency with other uses in the UI.

- On the other hand, I understand the "film" icon is also used in the UI to drag the video part of a clip (Project Bin/Clip Monitor), so not a visibility function. But, still, I can see the fact that the speaker icon is used both in Project Bin/Clip Monitor and the Timeline tracks, leads to mentally associate the pair if icons, reinforcing the intuitive expectation of seeing one when you see the other.
Perhaps, using a "music note" icon in Project Bin/Clip Monitor (instead of the "speaker" one) would help decouple the two uses (independent drag vs. visibility) with two different pairs of icons. So, eliminating the confusion for good.
Just brainstorming it...

(there's an attached image below, showing how it would look)