THANKS bupaje! I'll try it, but now I'm investigating what can I get playing with some parameters meantime change between Particles on/off in the timeline... I think that can be a way to get the result that I want, althought I'm having problems to show just only one Particle when I want, because if I put the Particle Count to 1, only one particle is showed at a time (until it dead), and if I put Particle Cout at several particles sometime appears 1, sometimes 3, or 2 without possible control about it... I'll try too duplicating (althought I dislike have duplicate layers everywhere) the Particle layer 3 times (i.e.) with the Particle Count to 1, for have three total controlable particles at a time

and I'll see what happen, hummm... I CAN'T WAIT!

...CIAO!
PS1: Particles are
SO fun!

PS2: ...I can't wait too that it become in animatable feature!
