Moving tempered music scale method and apparatus

A method of determining a sustained chord from a group of notes comprising:

• receiving notes;
• determining the amount of time each note has been sustained and keeping a history of the amount of time notes in the group have been sustained;
• comparing the amount of time to a threshold value which is dynamic and is a function of the history of the amount of time notes in the group have been sustained;
• determining a sustained cord type from notes whose amount of time exceed the threshold.

A musical device comprising:

• an input for notes tuned to a first scale;
• a retuning engine which determining a sustained chord as a group of inputted notes whose time of activation exceeds a threshold, which determines chord type of sustained chord, a chord interval position occupied by the notes of the sustained chord, and the order and spread of the interval positions, and which retunes selected inputted notes based on the determined chord type and order and spread of the interval positions in the chord;
• and
• an output for retuned and non-retuned inputted notes.