Description:
Restricts the melodic intervals to those intervals specified.
Args:
intervals (list of ints): Specified intervals.
absolute?: Controls whether the direction of the intervals is taken into account. The direction can be specified with a sign (positive for upwards, negative for downwards). If absolute? is set to :absolute, then the specified intervals can be used for any direction. By contrast, :up/down takes the sign of the given intervals into account.
mode: Controls whether to only use the given intervals (:only-given), or whether to only use intervals that are not given (:exclude-given).
Other arguments are inherited from R-pitches-one-voice.
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