I have noticed that the auto pilot trim doesn't respond to inputs, where as the the one on the IDG 28 does. I will try your suggestion. Also the \HUD does work, what am I looking for specifically there are 4 axis if my memory serves me correctly.
Edit: I did as you suggested. With the Hud active with the stick at rest the various axis appear centred. Although when I press 5 the aileron shifts very slightly but elevator is fine.
However when I press 5 before switching off AP the plane doesn't ballooning, it merely dips very slightly. Is there anything I can do to correct the fault. When I calibrate using joy.cpl everything looks fine. Is it the Joystick or the sim.