A stand for securely and gently cradling a stringed instrument such as a guitar. Each of the phase locked loop circuits includes a divider configured to receive the voltage controlled output signal and generate the feedback signal, a memory configured to generate a modulation profile codes and a sigma delta block. The head rest tilt mechanism drives the sub-frame so that the head rest body tilts forward while moving upward as the slide members are moved upward along the guide holes when the pressure receiving member is moved rearward. The normalized parameter set is then either presented in a visual display, e. The present invention is assembled variably according to a user’s need for conveniently moving and fixing thereby enhancing the practical value, increasing the esthetic thereof and beautifying the residential environment so as to achieve an effect of being practical and beautiful.