Tom Levescy,
The 3PM can be set up either way, Linear or switch (on-off)
You can assign different functions to different switches also. Some have there 3rd channel assigned to the + & - buttons on the front of the radio.... this requires you to remove your hand from the steering wheel to adjust (not my cup of tea) I have the 3rd channel assigned to one of the buttons on the handle itself, you can activate the switch (lean or richen) with your thumb.
I refer to it as "the magazine eject button on a pistol"
Hope this helps