I've only had GPO for about a week so it's possible that I'm missing something, but so far I've been unable to get any panning to work. I've used the standalone GPO program and Studio within Overture. I've tried adjusting the pannning knob in the Kontakt player and Overture's panning settings in the track menu, but the sound comes up completely centered every time. Is there some other setting I need to activate before panning will work?
All the instruments are pre-panned anyway, but if you want to manually adjust the settings via the tracks menu in overture you need to enable the option for standard volume and panning control in the GPO options menu. Click on the options button on the player.