Answer to MPX Quiz Q1:

  1. Goto Setup Control screen.
  2. Goto Spoiler control.
  3. Goto to NormPos attribute. Set NormPos according to stick position when spoiler is closed.
  4. Goto FIX.VAL.1 attribute. Set to zero and assign switch S1.
  5. Exit

Note: an alternative method of disabling the Spoiler control is to assign S1 to each page in the Servo Travel + Rev screen where Spoiler is an input. However (1) it's tiresome if a BUTTERFL mix is used since all four wing servos have to be adjusted and (2) it will not cancel aileron differential suppression which is still controlled by the position of the stick at all times.