sorry, I can't answer your question. But I can't resist commenting on PI: It works, I use it, but it is by far that hardest software to like that I regularly use.

The problem? It almost never opens. It seems that almost any hardware change will kill it - due to its software copying protection scheme. Recently, it seemed to die on me merely because I updated a hardware DRIVER! Getting it going again is a multi-step time killer. And after a few automatic renewals, you'll need to call them on the phone. It's such a nuisance that usually I save up a bunch of planned uses for PI and, once I get it going again, I do all of them at once. STAY AWAY FROM PARTICLE ILLUSION!

If I had it to do over again, I'd use the alternative. This one looks promising:

http://www.redgiantsoftware.com/products/all/trapcode-particular/