For example:
1,2: Monitor Speakers
3,4 : Headphones 1
5,6 : Headphones 2
7,8 : ...

Pressing the button, you can create a new master track with the next pair of outputs, attached to left side, and with the respective routing. (this can take a LOT of time if you need to re-route all tracks that are coming to Master track 1, to Master track 2)
it can help to change fastly between diferent devices to listen in each one. and open the way for new scripts like (if i have recording enable, Mute Monitor speakers Master Channel, or whatever you want.)
Here an example of my multiples outputs, that i need to change manually, and make slow my workflow.
