Monitoring a channel in your headphones before bringing it into the mix.
Pre-fade listen, or PFL, routes a channel to your headphones independent of the crossfader and channel fader, so you can hear a track the crowd cannot yet hear.
Why it matters
PFL is how you prepare a blend in private: cue the next track, line up the beat, and check the key before the audience hears a note of it.
In practice
Press the cue or headphones button on the channel you want to monitor. Use the split cue or cue mix knob to balance it against the live output.

