Acoustic device, unlocking method, program, and medium

Provided is an acoustic device provided with an operation piece, a memory, a processing unit, a control unit, and a display unit. The operation piece accepts a set value. The memory stores the set value. The processing unit performs processing in accordance with the set value stored in the memory. The control unit executes a normal state in which the set value stored in the memory is updated in accordance with the set value accepted by the operation piece and a lock state in which the set value of the memory is fixed irrespective of the set value accepted by the operation piece, and by either a first method for releasing the lock state when the set value of the memory and the set value accepted by the operation piece are the same, or a second method for updating the set value stored in the memory by the set value accepted by the operation piece and releasing the lock state, the control unit releases the lock state and enters the normal state. The display unit displays a selection screen for accepting selection of the first method or the second method.