American Audio"s VMS4.1 is designed for performance-minded DJs looking for a solid, all-in-one MIDI Controller to play MP3 tracks from their laptop, plus have the option to add CD Players and turntables to the mix. The VMS4.1 features four MIDILOG Channels (compatible with any MIDI Software or Analog Inputs - such as CD Players, Turntables, etc.), two microphone inputs, balanced XLR outputs, a built-in 4-In/4-Out soundcard , and comes with American Audios exclusive DSP D-Core Audio Engine inside. To top it off, it"s also bundled with Virtual DJ LE software so you"re ready to go right out of the box. Upgrades from it"s predecessor include entirely new internal hardware, quadruple the output, a bigger power supply, LEDs on the knobs and buttons that are brighter so it"s easier to use in dark club environments, a more stout facer mounting, and, most importantly, even better sound quality, especially the mic sound, quality, and output. The VMS.1"s more linear EQ design works better with Traktor software (sold separately), and it has advanced cell phone interface shielding so you don"t have to worry about unexpected performance issues in the middle of a gig. The VMS4.1 was also built with American Audio"s unique D Core processing so it is faster and smoother than their earlier products.4x MIDILOG channels (Compatible with any "MIDI Learn" software or analog inputs-such as CD players, turntables, etc.) DSP D-Core inside: Studio-quality audio engine + pro stage microphone circuitry 2 x Mics with Gain, Treble, Mid & Bass Control Crossfader curve adjustment Balanced XLR outputs Assignable touch strips Built-in mouse pad Built-in 4-In/4-Out soundcard Bundled with Virtual DJ LE software MIDI Controller with 4 USB / Analog selectable MIDILOG (MIDI & Analog) channels All audio control faders, knobs, switches, and buttons smoothed-eliminates popping, wiper noise, and zipper noise On/Off soft startup and turnoff Gain/treble/mid/bass EQ on all MIDILOG channels 2 phono/line selectable analog channels Two microphone channels with illuminated on/off switches and gain/treble/mid/bass EQs On/off cueing on each MIDILOG channel Split cueing headphones with rotary mix control Illuminated rubber knobs for ease of use in dark environments Solid 1.6mm thick faceplate for extra durability Panel mounted rotary knobs Full analog mixer operation if the computer crashes or with external power supply Innofader replaceable crossfader compatible (sold separately) Crossfader curve control Crossfader assign and reverse Q-Start crossfader controlled startup for 2 external audio players User replaceable channel faders Master and Booth outputs with L/R balance Balanced Master outputs 12 position stereo master output VU meter MIDI Features: Built-in mouse pad Long-life MIDI assignable touch strips Two 10-bit resolution pitch sliders 62 assignable MIDI buttons and switches 50 MIDI buttons have LED illuminations, including 18 with dual blue/red LEDs 4 assignable rotary encoders 34 assignable rotary controllers 5 assignable linear fader controllers Dual MIDI controls on all buttons and switches Dual 2000 point resolution touch sensitive turntable scratch controllers Audio Features: 24-bit 48kHz analog audio 16-bit 44.1kHz USB audio 10-bit resolution on all analog fader controls THD 60dB (for each audio channel, both line and phono mode) S/N ratio >85dB (for each audio channel, both line and phono mode) Analog channel audio latency < 1msec Selectable USB modes: 4-in/4-out mode for running software effects on phono/line analog channels or 2-in/8-out mode for running 4 software channels