Multiple Voices with Octave Lines

Example script (scamp): examples/Notation & engraving/Special notations/voices_with_octave_lines.py

Download: voices_with_octave_lines.py

Same as the voices example, but with ottava applied to certain voices. These ottava contradict one another when the voices are (by default) placed on the same staff, so the largest octave line wins and a warning is emitted. To avoid this conflict, set engraving_settings.max_voices_per_staff = 1 to place each voice in a separate staff.

Topics: Notation & engraving › Special notations

from scamp import *

s = Session()

piano = s.new_part("piano")

melody = (
    (0, 0.5), (3, 1/2 + 1/3), (2, 1/3), (5, 1/3), (3, 0.5), (None, 1.0), (5, 0.25), (6, 0.75), (7, 0.5)
)


def _do_melody(start_pitch, dilation_factor=1.0, properties=None):
    """Play the melody at a given pitch and speed, passing along the given properties to every note."""
    for interval, dur in melody:
        piano.play_note(start_pitch + interval if interval is not None else None,
                        0.7,
                        dur * dilation_factor,
                        properties)


def fork_melody(start_pitch, dilation_factor=1.0, properties=None):
    fork(_do_melody, args=(start_pitch, dilation_factor, properties))


s.start_transcribing()

fork_melody(70, properties=["8va", "voice: A"])
wait(2)
fork_melody(97, 2, properties=["15va", "voice: B"])
wait(4)
fork_melody(67, properties="voice: C")
wait(2)
fork_melody(35, 0.5, properties=["8vb", "voice: 4"])
wait_for_children_to_finish()

perf = s.stop_transcribing()

# default: allow 4 voices per staff, resulting in conflicting octave lines; largest displacement wins
perf.to_score(title="Awful version: 4 voices with conflicting octave lines in one staff.").show()

# use this setting to force each voice onto its own staff to avoid conflicting octave lines
engraving_settings.max_voices_per_staff = 1
perf.to_score(title="Using `engraving_settings.max_voices_per_staff = 1`").show()