ok, i wanted to do the same.
first, you might want to check the website for the SCALA app and related material:
then i suggest you have a look at this tutorial for using the Retune For Live max for live (free) device by Ursine (which i suggest you try because it’s really handy and can be a nice way to test scales before sending them to the er-301):
then if you want to extract a scale from an instrument i suggest you proceed like this:
1- record the instrument
2- find out the fundamental frequency of each note (spectrum analyzers of precise tuners might help)
3- if you have recorded 5 notes, you’ll end up with 4 intervals
4- divide the second note freq for the first note freq to find the first interval
5- repeat for third note and second note and so on
6- annotate all the frequencies and ratios
7- go to this website and translate frequency ratios into cents using the online calculator
8- open a text editor like TextWrangler and write your own .scl file.
the format is this one (keep in mind exclamation points are comments):
scale of the stryx bansuri made by hyena
so, first line is exclamation point followed by the scl file title with extension
second line is beginning of comment
third line is the description (in some apps it is visible, like in retune for live)
fourth line is the number of intervals
fifth line closes the comment
the next lines are the intervals in cents, one for line. you might even write them as frequency ratios like 5\4 if you want and if you can
then save your file with .scl extension,
here’s the .scl of the above example , it is the scale of a bamboo bansuri i made myself, the holes are totally random so the scale is absurd. i assure you that the .scl file reproduces it correctly!!!
hyenabansuristryx.scl.zip (743 Bytes)