Below is a step by step guide on how to use metric modulation in order to better visualize the exact duration of these types of tuplets...
A lot of people think about 32nd notes as a metric modulation that looks like this:
However, they fail to use this same type of rationale when thinking about nonuplets, dodecatuplets, and even sextuplets. Let’s take a second to visualize the steps to doing this:
First of all, what is your goal?
For this first example, our goal will be to understand how to equally divide a nonuplet:
Go through the same steps for dodecatuplets and sextuplets. The answers will be provided below. For the purposes of those answers, we will divide the tuplets in the following ways:
Dodecatuplet - 3 groups of four attacks
Sextuplet - 2 groups of 3 atttacks
If you did it correctly, your results should look like this:
You might be asking yourself:
Wait... Can't you divide the tuplets in other groups? Yes.
Why did you select those specific divisions? They happen to be my favorite ones.
What happens when you select other divisions? Your answers will be different, but still correct. Provided you performed all the steps correctly of course...
I feel like I should stress that these are all ways of trying to better understand divisions in tuplets. In no way am I saying that you should perform a metric modulation every single time you see a tuplet. This was written to help you better understand/visualize the duration of each one of the attacks.
That being said, visualizing your anchor points will help you perform your divisions in a more precise fashion. This is due to the fact that anchor points serve as a sort of "calibration/reference point". Having several of these points will help you adjust your tuplet in "real time" as you perform them.