Most players use the constant source to remember things like the time, radio presets, eq settings, etc.

...which is why it's called the "memory" wire. It's for remembering things.

The mk2 (and mk2a) can be turned on, even if the ignition is off, as long as you press a button to bring it out of standby within the time limit set in emplode.

This enables you to play music in your car at owner's meets without leaving your keys in the car.