Musical tool - variable question

joe84 · **Joined:** November 23rd, 2018, 10:52 am **Posts:** 7

Hi everyone,

I want to create a little key-finder tool that shows possible key scales when single notes are chosen.

E.g.:
- user chooses notes "c, a, h and e"
- opus pro highlights all possible key scales containing all of these notes

I thought of defining 12 variables (one for each minor key scale) containing the correspondending notes.

Then I thought of some kind of "pool" where all the user choosen notes are placed in.

Thirdly I need to tell opus pro to compare the pool with each variable and highlight all the variables containing all of the choosen notes.

Maybe that would work but I don't have the slightest idea how to set this up

Would be great if anyone of you could help me with the programming/variable part :-/

Best, Johannes

mackavi · **Posted:** November 23rd, 2018, 6:01 pm

Opus Pro Executable or Opus Pro HTML5?

</mack>

joe84 · **Joined:** November 23rd, 2018, 10:52 am **Posts:** 7

Opus Pro Executable

mackavi · **Posted:** November 25th, 2018, 9:38 am

The following should be a start:

Code:

myNotes = "A,C,F#";
myScale = "E,F#,G,A,B,C,D,E";

myScaleFound = searchScale(myNotes,myScale); //Returns True if found and False if not.

function searchScale(notes,scale){

var matches = 0;
var notesArray = notes.split(",");
var scalesArray = scale.split(",");

for (var n = 0; n < notesArray.length; n++){
    for (var s = 0; s < scale.length; s++){
        if(notesArray[n] == scalesArray[s]) {
            matches++;
            break;
        }
    }
}

if (matches == notesArray.length) {
    return true;
} else {
    return false;
} 


}

</mack>

joe84 · **Joined:** November 23rd, 2018, 10:52 am **Posts:** 7

Hi Mack,

thank you very much for your answer, I do not know how and where to add the code :-(

Here's the project as it is at the moment:
https://drive.google.com/open?id=1Sr7p5 ... aus3bNxQNQ

Would "myNotes" be the pool where all highlighted choosen notes are placed in? How do I program that?

And then I would need (for 12 different scales) 12 "myScale1",... ?
And all of them would be compared to "myNotes" and highlighted if "myNotes" are in the scales?

Thank you for your help and sorry for so many questions :-/

Best, Johannes

mackavi · **Posted:** November 28th, 2018, 11:31 am

Here's a working example:

link: https://www.interaktiv.co.uk/?section=files
code: piano-scales@digitalgrapevine.info

</mack>

joe84 · **Joined:** November 23rd, 2018, 10:52 am **Posts:** 7

Hi Mack,

thank you for the example file. That helps a lot! :-D

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Musical tool - variable question

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