A knob that blends the headphone signal between the cued channel and the master output.
The cue mix knob controls the headphone blend between the pre-fader cue signal and the live master output. Turning it fully to one side isolates the cued deck; turning it fully to the other plays only the master mix.
Why it matters
Lets the DJ audition an incoming track in isolation to beatmatch, then crosscheck it against the master before committing to the transition. Without it, cueing and monitoring require separate hardware or a split-cue mode.
In practice
Set the knob toward cue when beatmatching, then nudge it toward master to confirm the blend sounds clean in the room before opening the channel fader.

