Patent ID: 8586852

Claim:
A computer-readable non-transitory medium storing program instructions for musical performance that are executable by a computer of a musical performance apparatus which simulates a stringed instrument having a plurality of strings stretched in substantially the same direction and outputs sound based on movement of a predetermined target, the program instructions causing the computer to perform operations comprising: acquiring posture variation of the predetermined target in a predetermined interval based on measurement information concerning a posture or movement of the predetermined target; setting a volume parameter for deciding a volume according to an acquired posture variation; and outputting a sound signal of a volume according to the volume parameter; retaining string designation information which designates a string that is currently a target to be sounded among the plurality of strings; and changing a string designation upon a determination, based on the measurement information, that angular acceleration in a circumferential direction centered about a direction in which the plurality of strings are stretched has exceeded a predetermined threshold.