Electronic Musical Instrument Operating Device

An electronic musical instrument operating device configured to operate any parameter related to output of a sound source part included in an electronic musical instrument, the electronic musical instrument operating device comprising:

• a display configured to display a current value of the parameter of the electronic musical instrument;
• a touch panel input configured to receive input of a desired value of the parameter of the electronic musical instrument;
• a display control configured to, upon input of a desired value of the parameter of the electronic musical instrument received by the input part, change a first display state to a second display state, and display presence or absence of the desired value;
• a reflection part configured to reflect the change in the parameter of the electronic musical instrument from the current value to the desired value, provided that a relevant operation is performed by an operator;
• a restoring part configured to restore the desired value which has not been reflected on the electronic musical instrument to the current value, provided that a relevant operation is performed by an operator;
• and
• a determining part configured to determine presence or absence of the desired value that has not been reflected on the electronic musical instrument,
• wherein the display control restores display in the second display state on the display to the first display state, provided that the determining part determines absence of the desired value which has not been reflected on the electronic musical instrument.