Tone control device for digital piano

A tone control device for a digital piano, the tone control device comprising a support forming a key or a bottom surface of a key, and a base plate disposed opposite the support at a predetermined distance from the support and below the support;

• wherein a first movable part, a second movable part disposed at a predetermined distance from the first movable part and aligned with the first movable part, and a counter movable part disposed at a predetermined distance from the second movable part and aligned with the second movable part are installed on a bottom surface of the support;
• wherein a first sensor, a second sensor, and a counter sensor configured to detect the first movable part, the second movable part, and the counter movable part, respectively, are installed on the base plate, and slots configured to allow the first movable part, the second movable part, and the counter movable part to pass therethrough when the first movable part, the second movable part, and the counter movable part are moved downward are formed in the base plate;
• wherein, when the key is pressed, the counter sensor detects a degree to which the key has been pressed according to a downward movement of the counter movable part;
• wherein the first sensor detects a time when the first movable part passes the first sensor when the key is pressed, and the second sensor detects a time when the second movable part passes the second sensor when the key is pressed;
• and
• wherein the tone control device includes a control unit configured to adjust a tone of the digital piano, and the control unit determines a primary velocity based on a time difference between a passage time of the first movable part measured by the first sensor and a passage time measured by the second sensor.