what is an air synth?

[glissandro baby]

what is the purpose of that gear?

[Enigma™]

well, although slightly less programmable then the average synth, it IS much easier on the back. I find the output levels to be quite low however, and is often never to be contested with the mighty "Air guitar"

I'm sure you can probably find it on e-bay. :)

[Axe2Grind]

Maybe he means the Alesis Air Synth... info below:

http://namm.harmony-central.com/WNAMM01/Content/Alesis/HotPick/airSynth.html

[Shreddy]

Those units are really cheap now.

Check www.kraftmusic.com

[glissandro baby]

you can make sounds by waving your hand. hmmm