01-processes-spawning.py - Simple processes spawning, no synchronization. 
============================================================================================================================================


Need at least 4 cores to be really effective.

Usage:
    python3 -i 01-processes-spawning.py

.. code-block:: python

    import sys, time, random, multiprocessing
    from pyo import *
    
    if sys.platform.startswith("linux"):
        audio = "jack"
    elif sys.platform.startswith("darwin"):
        audio = "portaudio"
    else:
        print("Multicore examples don't run under Windows... Sorry!")
        exit()
    
    
    class Proc(multiprocessing.Process):
        def __init__(self, pitch):
            super(Proc, self).__init__()
            self.daemon = True
            self.pitch = pitch
    
        def run(self):
            self.server = Server(audio=audio)
            self.server.deactivateMidi()
            self.server.boot().start()
    
            # 200 randomized band-limited square wave oscillators.
            self.amp = Fader(fadein=5, mul=0.01).play()
            lo, hi = midiToHz((self.pitch - 0.1, self.pitch + 0.1))
            self.fr = Randi(lo, hi, [random.uniform(0.2, 0.4) for i in range(50)])
            self.sh = Randi(0.1, 0.9, [random.uniform(0.2, 0.4) for i in range(50)])
            self.osc = LFO(self.fr, sharp=self.sh, type=2, mul=self.amp).out()
    
            time.sleep(30)  # Play for 30 seconds.
            self.server.stop()
    
    
    if __name__ == "__main__":
        # C major chord (one note per process).
        p1, p2, p3, p4 = Proc(48), Proc(52), Proc(55), Proc(60)
        p1.start()
        p2.start()
        p3.start()
        p4.start()
        time.sleep(35)