I'm using Tom Granberg's super-emitter "Boom 3" and I want the yellow flash to occur once right at the first frame. I can't seem to get it to flash until frame 20 or so. How can I get that control? The flash is a New Emitter inside the main emitter.
If you take a look at the f-Number graph under New Emitter, you'll notice the graph has some keyframes on it. If you reset the graph and then set the initial keypoint to 60, it should flash on the first frame. Then set another key a few frames over with a value of 0 to shut off the booms.