I've added interval addition and subtraction as per the algorithm in Francois Pachet's "An Object-Oriented Rerpresentation of Pitch-Classes, Intervals, Scales and Chords: The basic MusES" (page 9).
Both are a bit untested, I really should write Quick Check properties and tests at some point.
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About Me
- Stephen Tetley
- Disambiguating biog as there are a few Stephen Tetley's in the world. I'm neither a cage fighter or yachtsman. I studied Fine Art in the nineties (foundation Bradford 1992, degree Cheltenham 1992 - 95) then Computing part-time at Leeds Met graduating in 2003. I'm the Stephen Tetley on Haskell Cafe and Stackoverflow.