Interesting, will have to look/listen to this in more detail later, but I found it odd to consider Slonimsky's "Thesaurus of Scales & Melodic Patterns" in the context of multiplication because he presents it as division and addition, dividing a pitch space (not necessarily an octave) into equal or unequal portions, then adding (infra-/ultra-polating) either chromatic, diatonic, or other chosen intervals above/below a given tone.

Also TBH though I have expended considerable time/energy trying to do so (lifelong musician and music-skool dropout), I find most serialism-based music, whether Schoenberg or Boulez, to be generally the very last thing I choose to put in my earholes, which is generally as much silence as possible, and music made by folks wanting to make an emotional connection to the listener regardless of genre or era.

As Varese said, "Music must sound" and intellectual satisfaction in the construction based on mathematical principles doesn't equal stuff I necessarily want to listen to. I was planning to do some serious study/practice over the long weekend, so I'll bust out the Thesaurus and see what happens. More thoughts later, but that's it for now!