Oh, I made a typeo here: Cubase (the full version) triggers and drives GA3 just fine. It should read: Cubase (the full version) allows Jamstix to trigger and drive GA3 just fine.
I am pretty sure that would be true of Artist as well.
On Sample sizes, I would think Superior’s 24 bit samples certainly would swell the size of them and yes, all the mic positions also has something to do with it. But I also would not be surprised to find out that Superior simply has more samples in it than does EZ2.
I think if you ever to go with the full Cubase version that you will pick it up rather quickly. You have about 80% of it now, (just a rough guess mind you). So transitioning over to it should be fairly easy for you.
LB