Quantizer minor pentatonic bug?

ER-301
#1

I played some with the quantizer today and it seems the build-in minor pentatonic scale is a bit off. Seems like it’s doing 0, 400, 500, 700, 1000, instead of 0, 300, 500, 700, 1000. Can anyone confirm this?

Oddly enough, when I made my own correct minor pentatonic and switched back and forth between them, the graphic representation of the third on the wheel, seemed to be in the same spot.

Could I be doing something wrong?
Sorry if this is the wrong place to mention this…

This is on 0.4.11…

#2

Ah, yes you are right. It will be fixed in the next release.

Thank you!

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#3

Oh I thought I was going mad

#4

Thanks!

#5

Brian, do you think it is a bug localized in this scale or affecting the whole scale quantizer? because i remember some months ago having some doubts about how it was quantizing on a custom scala file i made, but then forgot about it until now…

#6

AFAIK Just a mistake in entering numbers in the list and thus limited to this scale.

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#7

Maybe you could verify my observation: the graphics (placement of handles on the wheel) of the “buggy” build-in minor pentatonic and my correct minor pentatonic were identical (although the third was treated different). I might be mistaken, but it might also hint at something different going on…

#8

I suspect the display for custom scales might be a little odd.

Whole Tone, 12-TET and 24-TET built-in scales look like each slice of the “pie” is even, but this is what my custom 8-EDO scale looks like:

0002

I confirmed that the frequencies I’m getting out of the scale are as expected (if the root is 100Hz, the 4th step is 150Hz) and this is just a graphical issue.

My scala file is this:

! 8_EDO.scl
8-EDO scale
8
9/8
10/8
11/8
12/8
13/8
14/8
15/8
16/8
#9

What is wrong with it?

#10

I’m dividing the octave into 8 equal parts, so I’d expect 8 equal-sized pie pieces – just like when the 12-TET scale divides the pie into 12 equal-sized pieces.

#11

You have not divided the octave into 8 equal parts.

The ratio of 9/8 to 10/8 is not the same as the ratio of 15/8 to 16/8.

Keep in mind that the circle is essentially graphed in cents not frequency.

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#12

Oh right. My math and my logic were bad, sorry :frowning:

When I specify in cents it makes sense (and rhymes)

#13

Don’t feel bad. People have been trying to make equal-tempered scales with low numbered ratios for thousands of years and no one has succeeded. :wink:

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