Pre fader listening

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Preview (engl. Prefader Listening , in short: PFL) is the process a signal by a mixer is running, before the regulator tap off and to direct to a specific Abhörweg.

It is thus possible to listen to one or more audio sources before they are sent to the sum or to visualize them using technical equipment. Among other things, this allows the signal to be adjusted using filters or effects without disturbing the current mix.

The engineer may, for example, during a live concert, the microphone of the singer, guitarist, etc. put on his headphones to check its technical quality. In recording studios, the PFL signal can be routed to the control loudspeakers or to other sinks (targets) using routing . In radio studios, for example, the moderator listens to the next track while the current track is broadcast on the station . In this way, a DJ matches two records in terms of beat and speed.

On mixing consoles , the PFL function can usually be found with a button labeled "PFL" or "Cue" above or below the channel fader. In addition to their own volume control and a controller for determining the mixing ratio between the pre-listening and composite signals, some mixing consoles also offer the distribution of these two signals to the left and right pre-listening channels.