- all scale related code
- allow semantically correct adding/subtracting of
WesternPitchInterval
(see https://github.com/levinericzimmermann/project/blob/10.2/project/patches/music_parameters.py#L125-L181) music_parameters.WesternPitch.from_frequency
WesternPitchInterval
(see https://github.com/levinericzimmermann/project/blob/10.2/project/patches/music_parameters.py#L125-L181)music_parameters.WesternPitch.from_frequency