American Audio VMS4.1 4 Channel MIDI Controller Main Features: 4X Midilog Channels Software Or Analog Inputs - Such As Cd Players, Turntables, Etc.) - Dsp D-Core Inside: Studio Quality Audio Engine + Pro Stage Microphone Circuitry - 2X Mics With Gain, Treble, Mid & Bass Control - General Features: Midi Controller With 4 Usb / Analog Selectable Midilog Channels - All Audio Control Faders, Knobs, Switches, And Buttons Smoothed - Gain/Treble/Mid/Bass Eq On All Channels - 2 Phono/Line Selectable Analog Channels - 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 Audio Features: 24-Bit 48 Khz Analog Audio - 16-Bit 44.1Khz Usb Audio - 10-Bit Resolution On All Analog Fader Controls - Selectable Usb Modes: 4 In 4 Out Mode For Running Software Effects On Phono/Line Analog Channels System Requirements Pc Requirements: Windows Xp Sp2 Or Windows Vista (32-Bit & 64-Bit Supported) - Piv 1.2Ghz Computer (Sse2 Cpu), Amd 64 Or Greater - 1024_768 Svga Video - 2 Gig Ram (Vista) see site for more