Stanton C.504 Dual Rackmount CD Player with MP3 Playability Play MP3 encoded discs with the ability to pitch bend and change tempo while using effects Seamless looping, reverse playback, plus 10 seconds of sampling per deck Versatile pitch control with adjustable range (+/-4, 8, 16, 32, 100%) Key Lock and Key Shift functions 3 hot start/cue points Synchronizable effects like filter, flange, and delay Automatic BPM detection with Tap key Handy auto-cue function, plus fader start and continuous/relay play Anti-shock buffer&lt;BR/ Stanton's C 504 dual CD player is a dual-unit system so loaded with features, the controller takes up 3 rackspaces These features include a bigger jog wheel for more natural scratching and turntable-style control, plus 10 seconds of sampling per deck, MP3 capability, and a host of killer DSP effects The C