We've mentioned propagation a few times. Does that mean doors and such will block sound?

Yes, absolutely. So the propagation system has been long in development, and that's because of the amount of rework under the hood that's had to go on to support it fully, reworking the room system and creating mapping for that room system and things like this. And it's in progress now. I have working demos. One of the main things that it does from an audio perspective is respect when doors are opened and closed. It also respects angles of travel of sounds. So you can affect the way a sound sounds because of how many times it had to turn around a corner to get to your ears. And we can express a lot more about where the sounds are propagating from and via through this system. So, yeah, doors, absolutely.