Tone pitch changing device for selecting and storing groups of pitches based on their temperament

A pitch changing device comprising:

• operation content storing means for storing a content of an operation required for attaining a sound having a pitch which belongs to one of a plurality of groups of pitches, a frequency interval between each pair of adjacent pitches of each group being different among said plurality of groups of pitches;
• group selecting means for selecting and indicating one group of said plurality of groups of pitches;
• operation content reading means for reading the content of the operation, which is required for generating a sound having a pitch of said group selected and indicated by said group selecting means, from said operation content storing means;
• operating means for performing the operation in accordance with the contents of the operation read from said operation content reading means;
• operation result storing means for storing the result of the operation performed by said operating means;
• pitch indicating means for indicating a pitch which belongs to any one of the plurality of groups of pitches;
• pitch determining means for determining whether the pitch indicated by said pitch indicating means belongs to the group of pitches selected and indicated by said group selecting means;
• operation result means for reading the result of the operation performed by said operating means for the pitch indicated by said pitch indicating means when the pitch indicated by said pitch indicating means belongs to the group selected and indicated by said group selecting means;
• and
• group selecting control means for controlling said group selecting means to select and indicate a group of pitches which contains the pitch indicated by said pitch indicating means when the pitch indicated by said pitch indicating means belongs to a group other then the group selected and indicated by said group selecting means.