Right, that works for some of the knobs like the distance select for the MFD's but for like the altimeter setting knob, can't rotate it to change it or the altitude select knob. But left click does work for turning some but not all. The ones that have the two arrows superimposed when I move the mouse courser over the knob is the ones that I can't change. Even if I hold the LMB down. But the ones that the courser turns into a little hand and grabs the knob, those work ok. So is there a function key I have to program or is there a way to program the mouse for that function? Cheers, Rob