I call it the 'Human Laser Harp', and it consists  of a person wearing one or two laser gloves, with 5mw green or red lasers, with  four lasers on each glove. Along with an array of sensors connected to a  wireless or wireless  controller unit, a laptop computer and sound  system.The 'Laser Harp player' is free to dance and move with their gloves, which are battery powered. they can trigger loops of background tracks, and then over lay those tracks with unlimited selected chords, single notes, different instruments of all sorts, all while triggering stage lighting, video projection and other DMX controllable effects.
I will be demonstrating this system at the DNA Conference in Los Angeles on May 15-16. DNA US Conference 2012 :   New Interactive Frontiers in Leisure Facilities Innovative Digital Interactive Experiences  http://www.thestingerreport.com/us-conference.html
The person wearing these gloves 'plays' music and  other sounds or music and video /still image projections as well as stage lighting or any DMX controllable effect,  by shining the lasers  onto specially mounted photo-optic sensors, that are connected to a wireless or  wired controller unit.The wireless controller is faster than Bluetooth, using  our own protocol.
 The controller sends the signals to a laptop  computer and out to the sound system. The sensors are connected to the wireless  controller via long wires that allow the sensors to be set onto the walls or  scattered abut the floor of a performance space, or mounted and any way that can be dreamed up. There can be a large number of  sensors, with several/many on each channel, or just exactly the same number as there  is channels. The system can be from 8 to 32 channels.
Two additional sensors are 'control' sensors, that  when shined on can change the programming of all the other sensors to a  different pre-programmed selection of sounds and images/videos, in a 'song up', or 'song down' mode.. The software I  use can also control any stage lighting, smoke, pyrotechnics, or and other  effect that can be controlled via DMX. .
The OptiMusic software also allows for the sounds to be  modified via the intensity of the light shinning on the sensors, with a higher  level of voltage created when the lasers light is close to a sensor, as compared  to further away. So pitch or volume of the sound can be varied in this way, via  an analog effect.
Here are the specs on the software I use: 
OptiMusic - OMPC1 Software
For real time total multimedia events control
Music! SFX! Images! Videos! Lighting! & more…….!
The OMPC1 software receives inputs from up-to 32 sensor units via the USB data communication hardware and is processing pre-programmed events. Channels input: OptiBeams / IR / switches / sonic / Laser / pressure - or any 5V input, can be connected to one computer.
Windows OS based application for XP, Vista and Windows 7
Software works on Apple Mac using Parallels Desktop (running Windows applications on your Mac)
The system triggers file formats for Audio: .WAV .MP3 .WMA, MIDI
The system triggers file formats for Image/Video: .JPEG .BMP .MPEG .VOB .WMV.AVI .MP4
The system has a built–in DMX 512 channel virtual mixer - for controlling lighting, stage FX etc.
Main features:
 Processing up-to 32 inputs
 Real-time triggering
 2 triggering modes - Normal and Inverse
 Outputs up-to 256 events per beam
 128 settings per Auto Load project
 Event sequencing per beam in any conceivable order
 Outputs: MIDI or use internal audio card
 Outputs: DMX for Lighting control and stage effects
 WAV .MP3 .WMA, MIDI
 Outputs: Jpeg, BMP, Mpeg2 Avi, WMA, VOB and more
 Virtual MIDI keyboard for note editing and assignment
 Record notes from any external MIDI source (keyboard)
 Wave Mp3 file editor and assignment
 3 Wave file play modes: On/Off, Play to End and Loop
 Shutter / Relay control output up-to 32 channels
 4 Shutter / Relay modes
 Event Toggle
 Remote control navigation from any channel input
 Sensitivity input control per beam –Analogue input with thrash hold control
 Global Mute mode
 Global reset
