ex-permut-degree.py

#!/usr/bin/python

# import vital classes from isobar namespace
from isobar import *
import random

# create a pitch line comprised of multiple permutations on a pelog scale
ppitch = PShuffle([random.randint(-6, 6) for n in range(6)])
ppitch = PPermut(ppitch)
ppitch = PDegree(ppitch, Key("F#", "pelog"))

# create permuted sets of durations and amplitudes
# different lengths mean poly-combinations
pdur = PShuffle([1, 1, 2, 2, 4], 1)
pdur = PPermut(pdur) * 0.25

pamp = PShuffle([10, 15, 20, 35], 2)
pamp = PPermut(pamp)

# schedule on a 60bpm timeline and send to MIDI output
timeline = Timeline(60)
timeline.sched({'note': ppitch + 60,
                'dur': pdur,
                'channel': 0,
                'gate': 1,
                'amp': pamp})
timeline.sched({'note': ppitch + 24,
                'dur': pdur * 4,
                'channel': 1,
                'gate': 2,
                'amp': pamp})
timeline.sched({'note': ppitch + 72,
                'dur': pdur / 2,
                'channel': 1,
                'gate': 1,
                'amp': pamp / 2})

# add some continuous warping
warp = PWRamp(2, PBrown(-0.1, 0.01, -0.15, -0.05))
timeline.warp(warp)

# go!
timeline.run()