Sometime when you're fine cutting and tweaking effects or motion on a clip in a complex time line, it's useful to mementarily solo the clip to see the full extent of the changes you are making.
At the moment that means leaving the Effect Controls pane and adjusting the Track Output toggles in the Timeline.
It would be really handy to have a button that toggled a solo mode - just for the clip you are currently editing.
Thank you Adobe-World.
James