File: lpf.ck

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// LPF is a low-pass filter
Noise n => LPF lpf => dac;

// infinite time-loop
while( true )
{
    // sweep the cutoff
    Math.sin(now/second) * 110 => Math.fabs => Std.mtof => lpf.freq;
    // advance time
    5::ms => now;
}