modulation-example.py

#!/usr/bin/env python3

#------------------------------------------------------------------------
# SignalFlow: Modulation example.
#------------------------------------------------------------------------
from signalflow import *

def main():
    #------------------------------------------------------------------------
    # Create the global processing graph.
    #------------------------------------------------------------------------
    graph = AudioGraph()
    graph.poll(1)

    #------------------------------------------------------------------------
    # Create a regular impulse that is used to trigger an envelope and S&H.
    #------------------------------------------------------------------------
    clock = Impulse(8)
    frequency = ScaleLinExp(SawLFO(0.2), 0, 1, 200, 2000)
    sample_hold = SampleAndHold(frequency, clock)
    sine = TriangleOscillator(sample_hold) * 0.5
    env = ASREnvelope(attack=0.001, sustain=0.001, release=0.1, clock=clock)

    #------------------------------------------------------------------------
    # Apply the envelope, and stereo pan between speakers.
    #------------------------------------------------------------------------
    mono = sine * env
    stereo = StereoPanner(mono, SineLFO(0.5, -1, 1))

    #------------------------------------------------------------------------
    # Add some delay.
    #------------------------------------------------------------------------
    delay1 = CombDelay(mono, 0.1, 0.8)
    delay2 = OneTapDelay(CombDelay(mono, 0.05, 0.8), 0.125)
    stereo = stereo + ChannelArray([ delay1, delay2 ]) * 0.2

    #------------------------------------------------------------------------
    # Play the output.
    #------------------------------------------------------------------------
    graph.play(stereo)
    graph.wait()

if __name__ == "__main__":
    main()