In addition to the DVJ turntable players (virtually all DJs have two players for their "native" media of vinyl, CD, or DVD; some have additional players to accommodate other media, or they mix multiple sources at once), "DVJing" requires the use of an audio-visual mixing console, which allows the DVJ to select sources for audio and video and to blend or mix them. Many mixers also give the DVJ the ability to perform simple transformations on the video. Just as an audio mixing console allows for changes in equalizer levels, dynamics, and balance, an A/V mixer allows variations in hue, color saturation, brightness, sharpness, and other "TV-type" settings. They also allow for various types of transitions between video clips, such as fades, blends, and wipes. A/V mixers are nothing new to the recording and performance industry, but they are more often found in production rooms of television stations or editing suites of movie studios and are a new feature of live turntablist performances.