A ready to use buffer particle system
Drag the prefab onto your avatarUnpack the prefab
Take the 2 particle systems out of it, if you want
Each time you enable the Buffer Particle game object (after it was disabled), it will make the "Sub Emitter" emit particles.
Your particle system should be the "Sub Emitter" in this case.
1.) Drag it under the Buffer Particle game object
2.) Go to the sub emitter section of the Buffer Particle
3.) Add your system as one of the Sub Emitters and make sure it is set to "Birth"
4.) Make your own particle system not "Play on Awake"
5.) Set your particle system's emission to be 0 on both Rate over Time, and on Rate over Distance
6.) Add a burst to your particle system