A wind controller, sometimes referred to as a "wind synth", or "wind synthesizer", is a wind instrument capable of controlling one or more music synthesizers or other devices. Wind controllers are most commonly played and fingered like a woodwind instrument, usually the saxophone, with the next most common being brass fingering, particularly the trumpet. Models have been produced that play and finger like other acoustic instruments such as the recorder or the tin whistle. One form of wind controller, the hardware-based variety, uses electronic sensors to convert fingering, breath pressure, bite pressure, finger pressure, and other gesture information into control signals. Another form of wind controller uses software to convert the acoustic sound of an unmodified wind instrument directly into MIDI messages. In either case, the control signals or MIDI messages generated by the wind controller are used to control internal or external devices such as analog synthesizers or MIDI-compatible synthesizers, softsynths, sequencers, or even lighting systems.