The vibraphone resembles the xylophone, marimba, and glockenspiel. Every bar is paired with a resonator tube that has a motor-driven butterfly valve at its higher finish. The valves are mounted on a typical shaft, which produces a tremolo or vibrato impact whereas spinning. The vibraphone additionally has a maintain pedal just like that on a piano. With the pedal up, the bars are all damped and produce a shortened sound. With the pedal down, they sound for a number of seconds.