Every other interface I've used, I plug the headphones in and turn down the monitors turn up the headphones, that's it. The audio comes through the headphones. With this interface, when I turn down the monitors, the headphone volume lowers, as well. Same as when i turn the monitor dial to increase volume. The headphones dial works just the same, but I cannot seem to be able to figure out how to control the audio between the monitors and headphones separately. Any help is appreciated.