For anyone familiar with the Morningstar FX midi controllers the possibilities for a single foot switch are exponential when you can have different messages for short or long presses, or for double taps. Or for 1st and 2nd presses.
The most common is the tap tempo button that turns the tuner on when you hold it for longer.
It would be a delight if one foot switch could be one drive pedal for the first press and another for the second press. Or would turn on both drives with a quick double tap, or off if you held it for a second.
Cycle between two drives
Cycle between two delay times
Cycle between two amps
Or the like