Electronic musical instrument and electronic musical instrument system

A method comprising:

• generating a sound generation instruction signal in an electronic musical instrument including an internal sound source configured to generate an internal acoustic signal;
• outputting the sound generation instruction signal from the electronic musical instrument to an external sound source configured to generate an external acoustic signal;
• switching a first state in which the external acoustic signal is generated by the external sound source in response to the sound generation instruction signal to a second state in which the internal acoustic signal is generated by the internal sound source in response to the sound generation instruction signal;
• and
• automatically setting a mode of the internal acoustic signal such that the internal acoustic signal is generated with a mode similar to a mode of the external acoustic signal generated in the first state, when the first state is switched to the second state,
• wherein the electronic musical instrument further includes an input means configured to receive the external acoustic signal generated by the external sound source as a feedback acoustic signal;
• and
• a detection means configured to detect a state of input of the feedback acoustic signal to the input means,
• wherein switching includes detecting a state of input of the feedback acoustic signal to the input means, and switching the first state to the second state in response to a transition from a state in which input of the feedback acoustic signal to the input means is normal, to a state in which input of the feedback acoustic signal to the input means is not normal.

A non-transitory computer readable medium storing a program for causing a computer to execute:

• generating a sound generation instruction signal in an electronic musical instrument including an internal sound source for generating an internal acoustic signal;
• outputting the sound generation instruction signal from the electronic musical instrument to an external sound source configured to generate an external acoustic signal;
• switching a first state in which the external acoustic signal is generated by the external sound source in response to the sound generation instruction signal to a second state in which the internal acoustic signal is generated by the internal sound source in response to the sound generation instruction signal;
• and
• setting a mode of the internal acoustic signal such that the internal acoustic signal is generated with a mode similar to a mode of the external acoustic signal generated in the first state, when the first state is switched to the second state,
• wherein the electronic musical instrument further includes an input means configured to receive the external acoustic signal generated by the external sound source as a feedback acoustic signal;
• and
• a detection means configured to detect a state of input of the feedback acoustic signal to the input means,
• wherein switching includes detecting a state of input of the feedback acoustic signal to the input means, and switching the first state to the second state in response to a transition from a state in which input of the feedback acoustic signal to the input means is normal, to a state in which input of the feedback acoustic signal to the input means is not normal.