# [chuck-users] Help.

Niklas Reppel nik at parkellipsen.de
Mon Jun 8 09:28:17 EDT 2015

```It's just the formula to calculate semitones within the equal
temperatment tuning:

http://en.wikipedia.org/w/index.php?title=Equal_temperament#Twelve-tone_equal_temperament

Math.pow(...) is simply the exponent ....

On 08.06.2015 14:38, Casper Schipper wrote:
> Hi, I think you meant to put the frequency generation inside of the loop?
> Also, why don't you add some more steps to your 'scale' array ?
>
> For converting pitches: Std.mtof converts midi-values (ranged 0-128,
> 69 being A4) to standard tempered scale frequencies, bypassing your
> need to use Math.pow etc...
>
> You could just do: 69 => Std.mtof => sit.freq
>
> You may want to read the ChucK manual, which covers the basics much
> better then I could explain in a single email !
>
> Happy chucking,
> Casper
>
>
>
>
> // 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
>
> [ 1,5,6,7,15 ] @=> int scale[];
>
>
>
> // loop
>
> while( true ){
>     // freq
>
>
>     scale[Math.random2(0,scale.cap()-1)] => int freq;
>
> 220.0 * Math.pow( 1.05946, (Math.random2(0,2)*12) + freq ) => sit.freq;
>
>     //pluck
>
>     Math.random2f( 0.1, 0.9 ) => sit.noteOn;
>
>
>
>     //time
>
>     Math.random2f( .01, 1000 )::ms => now;
>
>
>
> }
>
>
>
>> On 8 jun. 2015, at 06:26, J Alexander Diaz <jalexander at diazsounds.com
>> <mailto:jalexander at diazsounds.com>> wrote:
>>
>> *// freq*
>>
>> *scale[Math.random2(0,scale.cap()-1)]=>intfreq;*
>>
>> *    220.0*Math.pow(1.05946,(Math.random2(0,2)*12)+freq)=>sit.freq;*
>>
>
>
>
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