Just switched my smoke programing on the 8FG from two p-mixes to the VPP function. Much easier IMHO. Since there are 3 VPP curves, I just set one to all zero's for pump off, one to track linearly with the throttle stick from 0% - 20% pump speed, and one to 100% pump speed on a the momentary switch for pump priming. Only thing I don't like about this set up is now I have a "VPP" indicator on my home screen. But, it's much easier for me to understand this way, and I can more easily tweak the settings now.
Additional info from rod-d:
I had a chance to help a friend configure this today, so here are some more details. We will be using 2 VPP curves:
#1 - Turns the pump off
#2 - Turns the pump on, with variable output based on throttle position
- Go to Model Menu->Pitch Curve. This should open curve #1 by default if you haven't configured it before.
- Scroll down into the curve settings and make all of the numbers in the left column -100. This effectively turns the pump off.
- Scroll up to the #1 and click RTN, then change it to curve #2.
- Scroll over to the "—" and click RTN, then select a switch to activate curve #2. In this example we will use SA.
- In the ON/OFF configuration, you can leave the defaults of position 1 Off, position 2 Off, position 3 ON. Or you can change that however you want.
- Now go back into the curve and move switch SA to the ON position. This will change the curve to #2.
- Adjust the lefthand columns to make the output of your pump the desired amount based on throttle position.
- Now go back into the Link Menu and select Function. Assign the VPP to your desired channel.
- You may find it necessary to reverse the VPP channel, which is on the Link->Reverse menu.
You can also add the 3rd curve as teookie mentions above, or you can prime the pump while it is on the ground. I don't have experience with these so I am not sure if you would ever need it at 100% while in the air to prime it
Hope this helps!