The Yamaha BC3 Breath Controller allows users to control MIDI breath control data by blowing into the device. It connects to a breath controller jack on a synthesizer, MIDI keyboard, or tone generator. The device features a headset that can be worn on the head or around the neck, and includes long and short pipes for different wearing positions.
Rotating the dial clockwise increases gain sensitivity so that a lighter breath produces a bigger value change.
You rotate the cap to close the drain and stop the venting of air from the mouthpiece.
Use the short pipe when wearing the headset around your neck rather than on your head.