The trick appears to be that the Linear Wipe effect is an Effect, not a Transition. It takes a bit of working out, to place the outgoing video clip on the next track up, then place the incoming clip under it, razor the outgoing at the point you want to start the effect, set keyframes, feathering, etc, and then render it to see what it looks like.
A great deal of fuss and bother for such a simple transition. Please Adobe, just add a ‘Feathering’ function to the wipe Transitions, and we’ll get the job done SO much quicker!
Anyone know how to create the Gradient Wipe mattes? Could there be a stash of them somewhere in PP? Or do you have to custom make each one in Photoshop? How long does that take? Doesn’t Adobe know we have schedules to keep?