Hi guys,

OK I've worked it out. Here is what I can now do. I can switch the smoke pump on and off at any time. When it is switched on, I can then get my throttle stick to start the smoke pump at 45% throw and it will run all the way up to full throttle. When I bring the stick back towards idle the smoke pump will switch off once the position goes past 45% again.

This is how the programming work. First set up smoke as a function, but with NULL control and NULL trim. Then go to program mixers and set up the first mixer. Click INH to become ON, set the button next to that to the switch you want to use for the on/off. Pay attention to the direction that you set as 'on'. Now set throttle as Master and smoke as Slave. Go across to the RHS of the screen and set up a spline curve. Move the throttle stick to where you want the pump to start and set up an opposite flat line to what you have before the start point. In other words (like in my case, the section before the switch point is at the top of the screen and then after that all the points are at the bottom of the screen). Next go again to Program Mixers, now set up a second mixer, but this time with the same switch having it's 'on' position opposite to the first mixer. Master and slave stays the same. For the spline curve, now keep ALL the points as you had them before the switch point for the total curve.

Basically the mixer now has what you want as a relationship between throttle and smoke when the smoke has been switched on, and when the switch is switched the other way, the mixer does not allow the throttle to start the smoke as it never switches on due to no switch point in the spline curve.

Works like a dream - thanks to my mate Shane (Bart on here).

Cheers,

Jan