Hi guys, I'm new to Greensock and particle animation and have been hacking away with simpler examples of this awesome pen you created for 3d particles.  See the Pen LVzxzR by GreenSock (@GreenSock) on CodePen .   What I want to achieve is being able to turn the particle emitter on and off like a tap (eg the already moving particles will complete their journey, but no new particles will be created by the emitter.   I experimented with trying to use kill({repeat:t