Hy Dave
as Jürgen explained - i although think, that this ist not a real On/Off Switch, like power on. i think that this is a 7 channel USB Transmitter. so your 4 channels for Rudder, Elevator, Aileron an gas are on the sticks, the "on/off" switch can be used for retract etc. (simple on/off function), the poti above maybe can used as a linear channel etc for canopy open/Close, and the switch on the left (if i'm right) seems to be a 3 Position switch, so you can use it for flaps etc. with 0%, 50% and 100%.
please let us know, if we're right.
Wolfgang