Final answer:
The fader function is a control on a mixing console or DAW that adjusts the volume of an audio track for recording on a Multitrack recorder (MTR) or during mixing.
Step-by-step explanation:
The fader function refers to a control featured on a mixing console or digital audio workstation (DAW) that adjusts the volume of an audio track. In the context of recording on a Multitrack recorder (MTR), a fader can be used to send a particular amount of signal from one track to another or to the main mix. When you use the fader to send a sound to the MTR, you are typically controlling how much of that sound is being recorded onto a track or how it is balanced with other tracks during the mixing process.
For example, if you are recording a song, you may want to adjust the level of the guitar track relative to the drums. You would move the fader associated with the guitar track to increase or decrease the volume until it sits well in the mix. This is an essential part of the music production process, ensuring each element of the recording is audible and balanced.