_{The variable speed pitch control, also called vari-speed, is defined as, “A control on an audio device that allows the operator to deviate from a standard speed.” This control can be found on different devices such as turntables, tape recorders, or CD players. Many of these devices are used by DJs when they want to increase the speed of a song. To do this, a small notch can be found on the turntable that you can manipulate to the desired speed. Zero is the original pitch of the song. Many DJs use this when trying to mix two songs. If the first song needs to be sped up to mix with the second song, the DJ just needs to move the notch to the proper beats per minute. This controls how fast the turntable will spin the record. Speed controls can be found in many different objects including motors or fans, so people could use the device in that way also. I do not personally have any experience with this device but I hear it being used when I am at a location with a DJ. The DJ will normally speed up or slow a song so it will merge well into the song up next. The song, “Friday I’m in Love,” by The Cure uses this device. The interesting background of the song is that they used the vari-speed control accidently, the song was supposed to be recorded in the key of D major. Robert Smith, one of the band’s members, did an interview where he explained what happened. He stated, “That was an accident, I was playing with the vari-speed [pitch control] and forgot to turn it off.” If it was not for the vari-speed control the well known, popular song would not be what it is today.}
https://youtu.be/ucX9hVCQT_U