on:on:on for three way switches and on:on for two way. A "normal" three way switch will have three states: on:off:off, off:on:off and off:off:on. The problem with IL-2 mapping software is, it doesn't differentiate between going from on to off between going from off to on. More often than not, when going from the center position to the left position for instance, it will recognize the center "button" going off instead of the left "button" going on. The latter is obviously what you want. Typical 4 way switches are usually OK, because they usually don't have a separate on/off state in the center position. Knowing this, it is possible to use the mapping software without manual editing (as far as I remember), but not without several tries. Normally a button would go off before the other one goes on, but it's probably only 70% of the time. In some cases it's almost impossible to get one particular button to show up (it will always recognize the center button going either on or off before it recognizes the left button doing anything, really annoying).