To permit more accurate performance of music for piano and other percussion instruments, better MIDI expanders make these kinds of sounds sensitive to the speed with which the musician presses the keys. To take advantage of this feature, touch-sensitive or velocity-sensing keyboards are required. Classic Organ Works can supply a velocity-sensing, optical key-switch assembly or complete keyboard. This can be integrated with the Classic Console Control Computer, to provide a pipe-organ console with one or more velocity-sensitive keyboards.