The early machines weighed up to 13 pounds and were piano key operated top-loader with red clocks and timers.

The first thing you notice are the piano key function buttons, which access everything from the climate to the satnav.

The player then hammers onto the strings with the fingertips in the same way that one would strike a piano key.

Striking the piano key with greater velocity increases the amplitude of the waves and therefore the volume.

In the silent mode, sensors pick up the piano key movement.