Ignoramus13314 fired this volley in
:

Wow, this is great, I see how I could have used it!!!!

Ig,

With a joystick, you may not have any 'on-off' switches. You certainly
would NOT want to impose on the driver the additional task of
manipulating switches separate from the joystick.

However, if you're driving a logic circuit or variable regulator with the
'pots' on a joystick, you can establish a range of travel that amounts to
a 'null' setting, where no current will flow. Anything outside that null
range would be considered an incremental setting for voltage/speed.

Lloyd