Abstract: A pneumatic foot pedal assembly for percussion instruments such as bass drums and hi-hat stands. The assembly permits adjustable mounting of a drum beater bar, foot pedal and drive chain while providing automatic return of the pedal to a neutral position by means of gas compressed upon depression of the pedal. Gas pressure within the pneumatic return mechanism is also adjustable. There is further optionally provided a substantially identical pneumatic unit for damping the return movement of both the drum pedal and hi-hat stand.