03-gated-verb.py - Gated reverb applied to a drum loop.
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The gated reverb effect, which was most popular in the 1980s, is made using a
combination of strong reverb and a noise gate. The drum sound passes through
a strong reverb, which is rapidly cut off with a gate driven by the dry signal.

.. code-block:: python

    from pyo import *
    
    s = Server().boot()
    
    # Play the drum lopp..
    sf = SfPlayer("../snds/drumloop.wav", loop=True)
    
    # Use a gate to generate the gain curve that will be applied to the reverb.
    gate = Gate(sf, thresh=-50, risetime=0.005, falltime=0.04, lookahead=4, outputAmp=True)
    
    # Strong reverb.
    rev = Freeverb(sf.mix(2), size=0.95, damp=0.3, bal=1.0)
    
    # Compress the reverb signal and control its amplitude with the gating signal.
    cmp = Compress(rev, thresh=-12, ratio=3, risetime=0.005, falltime=0.05, lookahead=4, knee=0.5, mul=gate,)
    
    # Balance between the dry and wet (gated-reverb) signals.
    output = Interp(sf.mix(2), cmp, interp=0.2).out()
    
    s.gui(locals())