02-linear-ramp.py - Portamento, glissando, ramping.¶
The SigTo object allows to create audio glissando between the current value and the target value, within a user-defined time. The target value can be a float or another PyoObject. A new ramp is created everytime the target value changes.
The VarPort object acts similarly but works only with float and can call a user-defined callback when the ramp reaches the target value.
The PyoObject.set() method is another way create a ramp for any given parameter that accept audio signal but is not already controlled with a PyoObject.
from pyo import * s = Server().boot() # 2 seconds linear ramp starting at 0.0 and ending at 0.3. amp = SigTo(value=0.3, time=2.0, init=0.0) # Pick a new value four times per second. pick = Choice([200, 250, 300, 350, 400], freq=4) # Print the chosen frequency pp = Print(pick, method=1, message="Frequency") # Add a little portamento on an audio target and detune a second frequency. freq = SigTo(pick, time=0.01, mul=[1, 1.005]) # Play with portamento time. freq.ctrl([SLMap(0, 0.25, "lin", "time", 0.01, dataOnly=True)]) # Play a simple wave. sig = RCOsc(freq, sharp=0.7, mul=amp).out() s.gui(locals())