RE: 9C Snap Roll Switch
I have the snap roll function programmed on a couple models in my 9C. The trainer switch activates it.
Where you see the OFF/INH values, OFF means its ready until you pull the trainer switch down. Then the value changes to ON.
INH means it is deactivated completely.
I don't think the switch to activate the snap roll function is assignable. You want a momentary switch for it. Such as the trainer switch. The assignable switch is for the direction of the snap roll.
The trainer function won't work at the same time as the snap roll mixing. As far as I know.
Hope that helps some.