Pitch wheel
In electronic music, a pitch wheel, pitch bend or bender is a control on a synthesizer to vary the pitch in a continuously variable manner (portamento). The first synthesizer with a pitch wheel was the Minimoog, in 1970. Alternatively, pitch bend controllers on synthesizers may be implemented as a joystick, knob, or touch-sensitive ribbon. MIDI represents pitch bend as a 14-bit integer, allowing for 16,384 possible values. General MIDI implementations default to a range of ±2 semitones.