 Older controllers occasionally used standard MIDI connectors, most controllers today are USB-based.Some controllers depart from the traditional two-deck system and incorporate four decks, effects sections, or do away with the traditional deck/mixer setup altogether, such as button grid controllers (originally intended to launch Ableton Live clips), drum pads MPC-style controllers (originally used for finger-drumming), touch-screen interfaces, arcade buttons and other devices.Many DJs use turntables and CDJs with timecode records to utilize the device in a similar manner as a controller.