By the way what I show you here are not exact instructions, they are more like ideas you could use in your ball machine. But i don't mind if you copy them.
ps im sorry for my bad english, im from holland
here is a link to trainmans instructable, it might be handy to use them both:
and a link to POWER TOWER, my latest ball machine
Step 1: Normal pathing
this is the most used path, its not very special but it will do.