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YAMAHA BREATH CONTROLLER BC1 

This Yamaha BC1 is an original accessory option used to control parameters in the DX7. With one of these, the player could use breath pressure to modulate harmonic "brilliance" or any other programmable value in the DX7. This BC1 has been used and exhibits some light wear. The BC1 is fully functional and operates as intended.

The Yamaha DX7 came with a mini-jack connection for an optional breath controller which sensed the air pressure inside the player's mouth and sent an analog output voltage to the DX7. The Yamaha BC1 breath controller, first developed for the analog synth but released in 1983 alongside the DX7, was gripped by the teeth of the player while the later BC2 and BC3 were supported at mouth level by a headset. With one of these, the player could use breath pressure to modulate harmonic "brilliance" or any other programmable value in the DX7. The breath controller allowed the DX7 to be used to produce sounds similar to a but with a piano keyboard for note selection. Many of the preset Yamaha voices allowed for breath-controlled modulation, and such modulation could be programmed into any other voice. However, pop musicians performing on stage did not usually want to put a breath controller in their mouth, for visual reasons. Yamaha also produced the WX series of dedicated which emulated familiar wind instruments.