unaffected by the individual track fader, thus not disturbing the stability of the feed that is being sent to the musicians. If a send mix is configured post-fader, then the level sent to the send mix follows changes to the main channel strip fader. This is useful for reverberation and other signal processor effects. An example of this is when an engineer would like to add some delay to the vocals – the fader can thus be used to adjust the amount of delay added. Pre-fader listen (PFL), after-fader listen (AFL) These functions will be found on a primary monitor function. This pre-fade listen is valuable since it allows one to listen through headphones in order to hear what the pre-faded part sounds like, while the studio loudspeaker is being used to monitor the rest of the program. Pre-fade listen can also be used for talkback as well as to listen to channels before they have been faded. After-fade listen only gets its information later. The choice of listen or level will depend on the user's interest: either with the quality and/or content of the signal or with the signal's level. PFL takes place just before the fader and has a joint channel and monitoring function. PFL sends the channel's signal path to the pre-fade bus. The bus is picked up in the monitor module and made accessible as a substitute signal that is sent to the mixer output. Automatic PFL has been made available, almost universally, and no longer needs to be selected beforehand. Pre-fade listen can also be incorporated in radio stations and serves as a vital tool. This function allows the radio presenter to listen to the source before it is faded on air; allowing the presenter to check the source's incoming level and make sure it is accurate. It is also valuable since live radio broadcasts can fall apart without it as they will not be able to monitor the sound. After-fader listen is not as useful in live programs. See also Beatmatching Beatmixing Gapless playback Harmonic mixing References Audio mixing Audio engineering Sound recording DJing Articles containing video clips