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"""
05-breakpoints-functions.py - Multi-segments envelopes.
Linseg and Expseg objects draw a series of line segments between
specified break-points, either linear or exponential.
These objects wait for play() call to start reading the envelope.
They have methods to set loop mode, call pause/play without reset,
and replace the breakpoints.
One can use the graph() method to open a graphical display of the current
envelope, edit it, and copy the points (in the list format) to the
clipboard (Menu "File" of the graph display => "Copy all Points ...").
This makes it easier to explore and paste the result into the python
script when happy with the envelope!
"""
from pyo import *
import random
s = Server().boot()
# Randomly built 10-points amplitude envelope.
t = 0
points = [(0.0, 0.0), (2.0, 0.0)]
for i in range(8):
t += random.uniform(0.1, 0.2)
v = random.uniform(0.1, 0.9)
points.insert(-1, (t, v))
amp = Expseg(points, exp=3, mul=0.3)
amp.graph(title="Amplitude envelope")
sig = RCOsc(freq=[150, 151], sharp=0.85, mul=amp)
# A simple linear function to vary the amount of frequency shifting.
sft = Linseg([(0.0, 0.0), (0.5, 20.0), (2, 0.0)])
sft.graph(yrange=(0.0, 20.0), title="Frequency shift")
fsg = FreqShift(sig, shift=sft).out()
rev = WGVerb(sig + fsg, feedback=0.9, cutoff=3500, bal=0.3).out()
def playnote():
"Start the envelopes to play an event."
amp.play()
sft.play()
# Periodically call a function.
pat = Pattern(playnote, 2).play()
s.gui(locals())
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