:orphan:

Octave Lines
============

*Example script* (scamp): `examples/Time & clocks/Forking & simultaneity/octave_lines.py <https://github.com/MarcTheSpark/scamp/blob/main/examples/Time & clocks/Forking & simultaneity/octave_lines.py>`__

*Download:* :download:`octave_lines.py <downloads/time_clocks_forking_simultaneity_octave_lines/octave_lines.py>`

A short passage of random notes for violin and piano, which uses the optional note properties argument to `play_note` to apply ottava when notes are very high or very low. The two parts run as parallel forked processes, an example of multi-part playback using `fork`.

*Topics:* :doc:`Time & clocks › Forking & simultaneity <time_clocks>`

.. raw:: html

   <div style="border:1px solid #ccc;padding:8px;margin:0.2em 0 0.6em;display:inline-block;max-width:100%"><img src="../_static/media/Time%20%26%20clocks/Forking%20%26%20simultaneity/octave_lines.svg" alt="score" style="max-width:100%;height:auto;display:block"></div>

.. raw:: html

   <div style="margin:0.6em 0"><audio controls preload="none" src="../_static/media/Time%20%26%20clocks/Forking%20%26%20simultaneity/octave_lines.mp3" style="width:100%;max-width:520px"></audio></div>

.. code-block:: python

   from scamp import *
   import random

   # makes output deterministic; comment out for variation
   random.seed(42)

   s = Session()

   s.tempo = 70

   violin = s.new_part("violin")
   piano = s.new_part("piano")

   s.start_transcribing()

   def violin_part():
       while s.beat < 16:
           pitch = random.randint(80, 105)
           ottava_mark = "15va" if pitch > 98 else "8va" if pitch > 90 else None
           violin.play_note(pitch, 0.5, 0.25, ottava_mark)


   def piano_part():
       while s.beat < 16:
           pitch = random.randint(25, 45)
           ottava_mark = "8vb" if pitch < 32 else None
           piano.play_note(pitch, 0.5, 0.5, ["staccato", ottava_mark])
           wait(random.choice([0, 0.5, 1.0]))


   fork(violin_part)
   fork(piano_part)
   wait_for_children_to_finish()

   perf = s.stop_transcribing()
   perf.to_score().show()