Hi max42,

First I would go into Parameters and null out the settings for both channels 5 and 7. Next go into Flaperon, and make it active, but at the bottom of the page it will ask you if you want channel 6 or channel 7 as your second aileron, here you will want to dial until you see the CH7 since this is the way you have yours set up.
Next go into a blank PMix, and you will need to make channel 6 the master and channel 5 as the slave, do not assign this to any switch just leave this blank, then go to the next page and set the amount of percentages you want the flaps to raise and lower with the dial.

This set up should get you what you are looking for.

I hope you find this information helpful. You can also reach our Futaba support technical team at 217-398-8970, or via fax at 217-398-7721.

Sincerely,
Krysta
Lead Futaba Customer Service and Programming Technician