All members of this family have a moving limb ——vu meter—— as a means of expressions. Analogue volume unit (vu) meter are used to visualize signal level commonly in audio equipments. Permanent magnet is in the center rotating pointer. There are coils that are around the magnet not touching but hovering. When the coil gets current through, forces are created in relative to the direction of the current and magnetic field. The forces moves the pointer that are one with the coil. This family uses this very sensitive limbs to create percussive noises and movements.
meter-schmitt-tapper