Questions on scamp.performance.Performance.to_score

#1

Hi, I’ve been recently trying to imitate your work in The Great Rhythm Work video, and I have a problem with displaying scores. Since the notation of indispensability (2 * 3 * 2) would be a time signature 6/8, I thought it should print it, but the error occurred.

from scamp_extensions.rhythm import indispensability_array_from_expression
from scamp_extensions.utilities import remap
from scamp import *

indispensibilities = indispensability_array_from_expression(
    "2 * 3 * 2", normalize=True)

MIN_SUBDIVISION_LENGTH = 0.3

s = Session(tempo=120)

# s.print_default_soundfont_presets()

perc = s.new_part("piano")

indispensibility_range = {
    54: (0.9, 1.0),
    61: (0.7, 1.0),
    49: (0.0, 0.7),
    54: (0.4, 0.7)
}

s.start_transcribing()

for i in range(4):
    for indisp in indispensibilities:
        for which_sample, indisp_play_range in indispensibility_range.items():
            if indisp_play_range[0] <= indisp <= indisp_play_range[1]:
                perc.play_note(which_sample,
                               remap(indisp, 0.5, 1.0, *
                                     indisp_play_range) ** 1.5,
                               MIN_SUBDIVISION_LENGTH, blocking=False)
        wait(MIN_SUBDIVISION_LENGTH)

s.stop_transcribing().to_score(time_signature="6/8").show()

And the error looks like this.

abjad.exceptions.AssignabilityError: not assignable duration: Duration(1, 12).

It only works well with 4/4. Due to my lack of knowledge, I have no idea why this error came out. Can anyone help me?

#2

That error suggests some sort of corner case that is breaking my quantization system. I’ll have to look into it!

That said, the reason that you’re running into a corner case is because you’re using an unusual note duration of 0.3 (your MIN_SUBDIVISION_LENGTH). If you change it to 0.5 (and perhaps compensate by making the tempo 120 * 5/3 = 200) then the notation turns out fine.

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