Volume problems

Hi there,
I do apolgise, I have literally just made an account and this seemed to be the most relevant topic I found, just started a new one, so I wont be a hassle anymore. I know i could turn off the monitors each time but I want to be able to only have playback in my headphones by doing something really easy (using a knob on the interface), rather than having the hassle of turning off both switches off/on when I wish to hear the monitors.

Take it easy!

Rich