random_arpeggio.py

from subprocess import Popen, PIPE, STDOUT, run, check_output
from pathlib import Path
from shlex import split
from random import randint, choice
import sys

PITCH = {
    "A": 27.500,
    "Bb": 29.135,
    "A#": 29.135,
    "B": 30.868,
    "C": 16.352,
    "C#": 17.324,
    "Db": 17.324,
    "D": 18.354,
    "Eb": 19.445,
    "D#": 19.445,
    "E": 20.602,
    "F": 21.827,
    "F#": 46.249,
    "Gb": 46.249,
    "G": 24.500,
    "Ab": 25.957,
    "G#": 25.957,
}
C_MAJOR_SCALE = ["C", "D", "E", "F", "G", "A", "B"]
G_MINOR_SCALE = ["G", "A", "Bb", "C", "D", "Eb", "F"]
G_DORIAN_SCALE = ["G", "A", "Bb", "C", "D", "E", "F"]

C_MAJOR_CHORD = ["C", "E", "G"]
G_MINOR_CHORD = ["G", "Bb", "D"]

octave = 3
scale = G_DORIAN_SCALE
note_length = 2
channels = 2
sequence_length = 12
repeat = 3
add_random_octaves = True
random_melody = True
repeat_bars = 4

if octave:
    for key, value in PITCH.items():
        PITCH[key] = value * (octave * octave)

command = Path("/usr/bin/alsabat")
assert command.exists()

if random_melody:
    melody = [PITCH[choice(scale)] for _ in range(sequence_length)] * repeat
else:
    scale = scale + [scale[0]]
    melody = [PITCH[key] for key in scale]
    rev_melody = [PITCH[key] for key in scale[::-1]]
    melody = melody + rev_melody
    melody * repeat

print(melody)


def rand_pitch(pitch):
    x = randint(0, 4)
    if x:
        return pitch * x
    else:
        return pitch


if add_random_octaves:
    melody = list(map(lambda x: rand_pitch(x), melody))

if repeat_bars:
    melody2 = list(map(lambda x: x * 2, melody))
    melody = melody + melody2
    melody = melody * repeat_bars

for frequency in melody:
    cmd = f"{str(command)} -F {frequency} -n {note_length * 1000} -P plughw"
    cmd = split(cmd)
    process = check_output(cmd, shell=False)

Ideas
Class melody

Zip(pitch_sequence, note_length seq) => note sequence

add rests

for beat in bar => note len seq