Well,
I can confirm that GA3 WILL NOT write to midi file and if you look at the old BB site you will find that Steiny has acknowledged this. Should they tell you up front? Sure - Will they? Um, I can not answer that.
BTW: I just put GA3 on a brand new 64 bit install and jBridged it. Now runs great, indluding writing to midi file direct from host.
Hope that helps.
LB