Breath controller, ¿que es?

Hola!

Hoy me a agregado un tipo de Noruega a mi canal de youtube(el tipo toca la guitarra)y sale tocando con una cosa que se llama Breath Controller...y no se exactamente como funciona.
Veo que el tipo lo usa con la boca y demas, pero nada mas. ¿Se supone que es midi? ¿Cual es su uso real? No lo entiendo....Aqui os pongo links de youtube para que lo veais para quien no sepa ahora mismo a que me refiero:

A wind controller, sometimes referred to as a "wind synth", "windcontroller", or "windsynth" , can loosely be defined as an electronic wind instrument. Wind controllers are, for no logical reason, most commonly played and fingered like a saxophone- though models have been produced that play and finger like other acoustic instruments such as the trumpet, recorder, tin whistle, harmonica, and others. A wind controller might convert fingering, breath pressure, bite pressure, finger pressure, and other sensors into control signals which are then used to control internal or external devices such as MIDI synthesizers, analog synthesizers, computer softsynths, MIDI sequencers, MIDI lighting systems, etc... A wind controller usually does not make a sound on its own- though a few have built-in synths. A wind controller is usually connected to some sort of sound generating device such as a MIDI or analog synthesizer or sound module / tone generator which is then connected to an amplifier. For this reason, a wind controller generally can sound like ANYTHING and is only limited by the capabilities of the connected sound generator. The fingering and shape of the controller are NOT related to how the wind controller sounds. A woodwind type wind controller can sound like a trumpet, drum, or barking dog. A brass type wind controller could sound like a sax, flute, etc.

http://www.patchmanmusic.com/WindControllerFAQ.html
Espero que te manejes con el ingles y lo entiendas :P