Your understanding me correctly I think, I need to control the mask shape path, without it being tied to the composition timeline, I think I once read of a way that the two start and end shapes could be key framed and then toggled between at will using a controller like an expression slider, but the place of the cursor in the timeline had no effect on the mask path, it was somehow disabled, the only thing controlling the shape of the mask was the slider assigned to the mask shape path.
When I try and pick whip the control I want to use to the mask shape path stop watch (after creating my two start and end shapes) I get an error saying. . .
