I'd love to compare notes with someone who is using Garritan with Gig Performer. I'm mostly a finale user (experienced, though not expert) and a casual Garritan user, mostly with Finale. I decided to use Garritan for some live shows coming up and I can't get it to cooperate with gig performer except on Midi channel 1, which is limiting. Can't tell if it is a problem with Garritan or Gig Performer, cause I'm not much of an expert at either at this point. 

I can tell that Garritan IS working on the other channels because the little keyboard at the bottom of the screen does play sounds. 

I'm using this on a PC with Aria Player 1.872 and Gig Performer 3. Thanks.