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Scales
======

*Example directory* (scamp_extensions): `examples/Pitch/Scales & microtonality/scale_example <https://github.com/MarcTheSpark/scamp_extensions/tree/main/examples/Pitch/Scales & microtonality/scale_example>`__

*Download:* :download:`scale_example.zip <downloads/pitch_scales_microtonality_scale_example/scale_example.zip>`

**Requires the** ``scamp_extensions`` **package** (``pip install scamp_extensions``).

Demo of the scamp_extensions Scale object, a highly flexible representation of a scale that can be indexed into infinitely in both directions from a root note. Scales can be microtonal (and even loaded from a scala file), and are constructed from intervals that can be expressed as either a frequency ratio, a distance in cents, or a combination of the two. Scales can also be transposed and modally rotated.

*Topics:* :doc:`Pitch › Scales & microtonality <pitch>`

.. raw:: html

   <div style="margin:0.6em 0"><audio controls preload="none" src="../_static/media/Pitch/Scales%20%26%20microtonality/scale_example/scale_example.mp3" style="width:100%;max-width:520px"></audio></div>

.. code-block:: python

   from scamp import *
   from scamp_extensions.pitch import Scale, ScaleType
   from fractions import Fraction

   s = Session(tempo=100)

   clarinet = s.new_part("clarinet")

   scales = {
       "C blues": Scale.from_pitches([48, 51, 53, 54, 55, 58, 60]),
       "Bb locrian": Scale.locrian(58),
       "Microtonal example 1": Scale(ScaleType(26., 104., Fraction(3, 2), (600., Fraction(5, 4)), 2, (204., 2)), 55),
       "C whole-half Octatonic": Scale.from_pitches([48, 50, 51]),
       "C half-whole Octatonic": Scale.octatonic(48, whole_step_first=False),  # different means of construction
       "C Melodic Minor": Scale.melodic_minor(48),
       "D Acoustic": Scale.melodic_minor(50, modal_shift=3),  # the "acoustic" scale is a mode of the melodic minor
       "Overtone Series": Scale(ScaleType(*(Fraction(n, 1) for n in range(2, 32))), 40, cycle=False),
       "Microtonal example 2:": Scale.from_start_pitch_and_cent_or_ratio_intervals(
           55, ["200.", "5/4", "200., 5/4", "3/2", "7/4", "2"]),
       "Bohlen Pierce from Scala File": Scale.from_scala_file("bohlen_12.scl", 48)
   }

   scales["Bohlen Pierce Transposed"] = scales["Bohlen Pierce from Scala File"].transposed(7)

   for scale_name, scale in scales.items():
       print("Playing notes of the {} scale.".format(scale_name))
       for scale_degree in range(0, 16):
           clarinet.play_note(scale[scale_degree], 1.0, 0.25)

       print("Playing chords from the {} scale.".format(scale_name))
       for scale_degree in range(0, 16):
           clarinet.play_chord(scale[list(range(scale_degree, scale_degree + 5, 2))], 1.0, 0.25)