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())