
Get your laser harp action on. No MIDI - USB Only. Not sure if you can use/mod it to control external gear.
"The beamz system has a "W" shape, with six laser beams spanning the two sections; connect via USB to your PC or laptop, and hook up some speakers. The simple, intuitive computer interface makes it easy to choose any of 30 included songs in 19 musical genres for laying down a complementary rhythm track. The beamz library includes original works in jazz, bluegrass, classical, hip-hop, reggae, heavy metal and more.
Breaking the laser beams with your hands automatically generates pre-authored pulses, streams, riffs or loops of musical notes or sounds from an incredible variety of instruments from around the world — guitars, steel guitar, strings of all types, percussion, keyboards, winds.even cowbell. Sophisticated high-fidelity sounds seem to pour from your fingertips like magic!

# Extraordinary invention fuses the interaction of your hands with laser beams to create the sounds of hundreds of different instruments.
# Breaking the laser beams with your hands automatically generates pre-authored pulses, streams, riffs or loops of musical notes or sounds from a variety of instruments — all kinds of strings, keyboards, winds, percussion. Sophisticated high-fidelity sounds seem to pour off your fingertips like magic!
# Choose a complementary rhythm track from 30 original songs in 19 music genres, including jazz, bluegrass, classical, hip-hop, reggae, heavy metal and more.
# The beamz system has a "W" shape, with six laser beams spanning the two sections; connect via USB to your PC or laptop, then hook up some speakers and you're ready to perform great-sounding music.
# Includes software CDs and USB cable for connecting directly to USB port of your PC or laptop."
more info including pdf at
The Sharper Image. Or you can
build this. You can find all posts mentioning laser harp
here (scroll when you get there).