Any open 3 position switch that you are not using would be fine.
Am I correct that you want the Center position to be more or less empty, or that it leaves the switch neutral? If so, then I would have you do two Offset Pmixes in your radio, assigned to the switch in the Down position and the Up position.
An Example:
Pmix 1
Set INH to Off or On
Set the Master as Offset
Set the Slave as CH8
Cursor Right and set the rate to +100%
Cursor Right leave the Link off
Cursor right set the Switch to C in the Up position.
Now go to the next Pmix and do the same exact thing, but set the Switch to C Down.
This will leave the Center of the switch free but allow you to set the Zoom with one direction of the switch and the shutter with the opposite direction.
Sincerely,
Krysta
Product Development & Support Specialist
Futaba Service Center USA
[email protected]