Waveguide musical tone synthesizing apparatus with noise modulation of waveguide coupling

A musical tone-synthesizing apparatus comprising:

• a plurality of waveguide networks each including at least one waveguide, each of said waveguides having a closed loop in which a signal circulates as a circulating signal in response to an external excitation signal, said closed loop having an output through which said circulating signal is output as a waveguide output signal, and an input through which a signal is input to be superposed on said circulating signal each waveguide network further including signal-forming means for forming a network output signal based on said waveguide output signal,
• modulating signal-generating means for carrying out signal processing on an externally provided noise signal to form an external modulating signal, and
• connection means connected to said waveguide networks, for carrying out signal processing on said network output signal delivered from each of said waveguide networks, based on the external modulating signal, and for inputting the resulting processed signal to said input of said closed loop of said at least one waveguide of each of said waveguide networks, said connection means controlling connection characteristics of said plurality of waveguide networks based on said external modulating signal.