Comentario oficial
That's because the master cue audio is taken pre-master level so if you have the master volume down, you can still cue a proper level in the headphones. This change was made in the NXS2 model by request of DJs. If you want to have consistent levels between the master and channel cues, simply match the levels between the channels themselves and the master output on the meters, then selecting a channel or previewing the same channel on the master will have the same volume in the headphones when the mix is at 12 o'clock.