I'm confused on this and the docs are a bit scattered. What I have is a normal game post process volume, and then a "rage" game post process volume when the player uses a powerup. So I want to smoothly transition to that rage post process volume and also smoothly flash it for a few seconds before the timer is up to let the player know that it's about to end. The only option that I know of is to keep 2 volumes on at the same time and then change each weight in opposite directions during the transition. But wouldn't that be terrible for performance because then the device has to do double the post processing workload? I'm not exactly sure how that works in the background. Is Unity actually going to post process once, and then again, or does the engine take the individual values of each volume and then blend them before calculating the post processing?