Many companies have unique technologies that are designed into their DJ CD Players. Denon for instance has a feature that allows the user to play two tracks from the same CD at the same time with separate outputs for each track; Tascam have developed a wheel controller that can be used with any turntable to provide vinyl control for their CD decks; Numark are pioneering the use of CD/Hard Disk hybrid systems allowing the user to store their tracks inside the unit itself, whilst Pioneer, one of the first manufacturers of DJ CD players, has become the first company to manufacture a DJ/VJ DVD Player - this machine has the ability to scratch and mix audio and video at the same time, bringing a new dimension of possibilities to both DJs and VJs.