The American Audio VMS4.1 is designed for performance minded DJs looking for a solid, all-in-one Midi Controller to play MP3 racks from their laptop, plus have the option to add CD Players and turntables to the mix. Some general features include 4 USB / Analog selectable Midilog (Midi & Analog) channels. 2 phone lines selectable analog channels. It also has gain/treble/mid/bass EQ on all MIDILOGTM Channels. It has full analog mixer operation if the computer crashes or with external power supply. Another nice feature is it has split cueing headphones with rotary mix control. The Crossfader has curve control and assign and reverse. Master & Booth outputs with L/R balance. It has DSP D-Core inside, Studio Quality Audio Engine + Pro Stage Microphone Circuitry. It has 34 assignable rotary controllers, 4 assignable rotary encoders. 50 MIDI buttons have LED illuminations, including 18 with dual blue/red LEDs. 62 Assignable MIDI buttons and switches. Dual 2000 point resolution touch sensitive turntable scratch controllers. Dual MISI Controls on all buttons and switch's. 5 assignable linear fader controllers. Two 10 bit resolutions pitch sliders. Long life MIDI assignable touch strips and a built in mouse pad.