There is provided a musical tone control system capable of controlling the
generation of musical tones in a manner reflecting only motion or
physical posture suitable for the musical tone generation control when
controlling the generation of musical tones reflecting motions of a
plurality of users or a plurality of body parts thereof or physical
posture thereof. A plurality of motion detecting devices capable of being
carried by operators detect motions of the users or operators carrying
the devices, and transmit detected motion signals indicative of the
detected motions. A receiver device receives the detected motion signals
transmitted from the plurality of motion detecting devices. A CPU control
extracts at least one detected motion signal satisfying a predetermined
condition from the detected motion signals received by the receiver
device and controls musical tones to be generated, based on the extracted
at least one detected motion signal.