Stringed musical instrument and acoustic effect device

An acoustic effect device used for a stringed musical instrument, comprising:

• a pickup configured to:
• i) detect vibration of a string of the stringed musical instrument and ii) output a string vibration signal according to the vibration;
• a detection sensor configured to be attached to a musical instrument body of the stringed musical instrument and output a detection signal according to a force applied to the musical instrument body;
• and
• a controller configured to output, based on the detection signal, a control signal configured to control an operation of an effector configured to impart an effect onto the string vibration signal, wherein
• the musical instrument body includes a hollow part that has a front plate, a back plate, and a side plate,
• the detection sensor is attached to an inner surface of the front plate, inside the hollow part, and
• the detection sensor is also configured to detect a deflection in the musical instrument body.

A stringed musical instrument comprising:

• a musical instrument body configured such that a string is attached thereto;
• a pickup configured to:
• i) detect vibration of the string and ii) output a string vibration signal according to the vibration;
• a detection sensor configured to output a detection signal according to a player's operation performed with respect to a front plate or a back plate of a hollow part of the musical instrument body;
• and
• a controller that is attached to the musical instrument body, and is configured to output, based on the detection signal, a control signal configured to control an operation of an effector that is configured to impart an effect onto the string vibration signal, wherein
• the detection sensor is attached to an inner surface of the front plate, inside the hollow part, and
• the detection sensor is also configured to detect a deflection in the musical instrument body.