There are remnants of the first explosion on the outside, then the second explosion a little bigger and closer to the emitter, then the third explosion is just getting started. The results look something like fireworks going off. Every time there is a group of 3 keyframes a little explosion happens, the particles get bigger very quickly then the size goes down. The size over time is animated by the curve you see in the effects control panel. The sets of 3 keyframes go from zero and 1000 and then back to zero. Something like this would get you started on seeing how animating the number of particles per second makes them behave. Just poking around with some values and some properties and running previews is pretty much a waste of time. Start by playing with the controls and some keyframes to figure out what approach you want to take before you try and use Sound Keys to control the animation. Once a particle is emitted and started down it's path you can only influence that path, the size and the color of the particle over its lifetime. You can animate gravity, wind, but you cannot increase the number of particles after they have left the emitter. Once the particle has been emitted it is moving with a certain speed. There is an emitter which has a defined size and position, there is the particle, and then there is particle velocity. You have to start by understanding how particle systems work.
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