One of the main advantages of electronic instruments is the possibility to set the volume at a lower level and play without bothering the neighbours. But acoustic instruments now offer an interesting alternative: by depressing the middle pedal or pulling a lever, hammer heads are prevented from hitting the strings. The piano is then no longer an acoustic instruments, but still keeps its traditional keyboard qualities. Only you hear what you play. When the system is not activated, you can enjoy all the normal acoustic qualities of your instrument. This technical break-through has attracted many players.