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/usr/share/doc/chuck/examples/basic/fm3.ck is in chuck 1.2.0.8.dfsg-1.4.

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// actual FM using sinosc (sync is 0)

// modulator to carrier
SinOsc m => SinOsc c => dac;

// carrier frequency
220 => float cf => c.freq;
// modulator frequency
20 => m.freq;
// index of modulation
200 => m.gain;

// time-loop
while( true )
{
    1::second => now;
}