After playing around for little while after doing this lecture I thought it would be nice if the door lock sound only played while the door was opening, so I took the challenge and came up with the following modification to the door blueprint.
It seems to work fine for me, and it might come in useful for someone else. I wonder if there’s an even simpler / more efficient way to do it! I’m thinking the Event Tick is signalling the branch every frame, which could possibly be improved upon…
I’ve highlighted the new nodes in the orange comments box, it simply gets the direction of the door swing and passes that to a gate, which only lets the play sound logic execute if the swing direction is forward.