The Akai Professional EWI4000S is a giant leap in the evolution of  wind instruments. The heart of the EWI4000S is its "first in the  industry" built-in sound module that lets musicians plug a wireless MIDI  or audio set up into the base of the EWI, and move freely around the  stage without being tethered by wires. At Akai Professional, we understand that artists want to concentrate  on creating and performing music, not manipulating buttons, so we've  made the breath, vibrato, glide time, and bend width controls easily  accessible and totally adjustable. In addition, the included software lets both Windows and Mac users  edit, customize, store and recall sounds with their computer. The  EWI4000S delivers incredible versatility, ultimate mobility and  remarkable creative expression that brings a musical revolution to your  fingertips. FEATURES: Electronic Valve Instrument (EVI) fingering mode for brass  players Touch sensitive keys and octave roller for quick and responsive  playing Sensitive breath sensor for expressive dynamics Built-in analog modeling synth sound module Built-in MIDI output for use with sound modules PC and Mac Editor software for customizing, storing and  instantly recalling internal sounds Lightweight and portable design with battery power SPECS: Polyphony/Multitimbral Parts: 2/0 Filter Types/Resonance: LP/HP/BP/BR dual filters in serial Single Programs ROM/RAM: 99 Portamento: Yes Built-in Computer Interface/Type: YES/MIDI Controller Inputs: Breath, touch pads # of Effects Processors/Effects: Chorus, Delay, Reverb # of Audio Outputs/Type (2) 1/4" , 1/8"stereo headphone