// Door Pound, P. Cook, Feb. 6 2009
Noise n => Gain g => PoleZero pz => LPF lp => Delay d => Gain gglobal => dac;
lp => gglobal => dac;
.085 => gglobal.gain;
0.1 :: second => d.max => d.delay;
Impulse i => OnePole p => g;
0.999 => p.pole; 3 => g.op;
1 => pz.blockZero;
150.0 => lp.freq;  1 => lp.Q;

knock(5,1.0);
1.0 :: second => now;
knock(6,1.05);
0.8 :: second => now;
knock(3,1.20);


fun void knock(int numTimes, float howEnergetic)   {
    while (numTimes > 0)    {
        Std.rand2f(0.01,0.04) :: second => d.delay;
        Math.pow(10.0,howEnergetic) * 20000.0 => i.next;
        (Std.rand2f(0.25,0.32)/howEnergetic) :: second => now;
        numTimes - 1 => numTimes;
    }
}