// name: dtmf.ck// desc: dual tone multiple frequency//       (can be played into analog phones to place calls)// author: Perry Cook SinOsc row => dac;SinOsc col => dac; // frequencies[1209.0, 1336.0, 1477.0] @=> float cols[];[697.0, 770.0, 852.0, 941.0] @=> float rows[]; // if you want to look up by number ( 0 - 9, *, # )fun int key2col( int key ){ if( !key ) return 1; return (key - 1) % 3; }fun int key2row( int key ){ if( !key ) return 3; return (key - 1) / 3; } 0 => int i;int r,c,n; // go!while (i < 7) {    .5 => row.gain;    .5 => col.gain;    Math.random2(0,3) => r;    Math.random2(0,2) => c;    1 + r * 3 + c => n;     if (n==11) 0 => n;    if (n==10) {        <<< r , c, "*" >>>;    }    else if (n==12) {        <<< r , c, "#" >>>;    }    else        <<< r , c, n >>>;     rows[r] => row.freq;    cols[c] => col.freq;     0.1 :: second => now;    0.0 => row.gain;    0.0 => col.gain;    0.05 :: second => now;    i + 1 => i;}