In the above picture by Mark, the turn knob has two functions, pitch & roll.

I'm telling you this not knowing if this is what you are doing or if you have tried it, so please forgive me if you have done this already.

If you mouse click on the area of the number 2 in the photo, you will get the autopilot to trim the nose UP. If you just click once or twice you will get very small movements of the trim. If on the other hand you hold the mouse button down, you will see a lot of movement of the pitch.

This was not my favorite autopilot, but if you made small movements of the knob in pitch, it would do an OK job. Some of the pilots would use just the AIL paddle to control heading and just use the autopilot trim on the center console marked CRUISE TRIM.

If you are still having problems, let us know and we'll try something else.

Lou