I'm needing help understanding what the code for the frequency down below in bold text is doing. 

Context: I'm trying to build a code that will randomly pick frequencies and rhythms within a given range. As time passes my goal is to write a code that will also allow the frequencies and rhythms to change. I know I'm not ready to understand how to code this yet as I am teaching myself at my own pace. But I would like some help if maybe someone could talk me through what the frequency portion of this code is doing. I took the frame of most of my code from a ChucK example and am changing it for a composition of mine.

I don't understand the relationship between the scale part and the freuency part.

I don't understand the Math.pow.

I do understand math.random2, int, and freq.

Thank you much!!

// Sitar

Sitar sit => JCRev r => Echo a => dac;

// gain

.56 => r.gain;

// reverb mix

1.12 => r.mix;

// max delay for echo

1120::ms => a.max;

// set delay for echo

112::ms => a.delay;

// initial effect mix

0.0 => a.mix;

// scale

[ 15 ] @=> int scale[];

     // freq

    scale[Math.random2(0,scale.cap()-1)] => int freq;

    220.0 * Math.pow( 1.05946, (Math.random2(0,2)*12) + freq ) => sit.freq;

      

// loop

while( true ){

     

    //pluck

    Math.random2f( 0.1, 0.9 ) => sit.noteOn;

    

    //time

    Math.random2f( .01, 1000 )::ms => now;

         

         }

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