degree-type-value data type
The degree-type-value type indicates whether the current degree element is an addition, alteration, or subtraction to the kind of the current chord in the harmony element.
Base type: string
|add||If the degree element is in addition to the kind of the current chord.|
|alter||If the degree element is an alteration to the kind of the current chord.|
|subtract||If the degree element is a subtraction from the kind of the current chord.|