Great walkthrough, and I'm so glad you're sharing tips like this. We often see tips on proper balloon usage, like the latest creator's guide or Nate Piekos' 10 Mistakes Made by Amateur Letterers, which are useful guides for understanding the mechanics of creating word balloons, but seldom do we see guides for thinking of word balloon/sound elements as design tools in our comics.
You can do some seriously creative storytelling using thoughtful balloon placements. An example I often cite is the 80s comic Amethyst, Princess of Gemworld, by Dan Mishkin, Gary Cohn, and Ernie Colón. In the following example they got double-duty out of two panels through word balloon placement:
This is an aspect of comics that many creators overlook, and I'm always excited when I see people using sound elements in an integrated, thoughtful way.
I recently had a 2-hour discussion with cartoonist Zack Giallongo (Ewoks: Shadows of Endor, Broxo, The Stratford Zoo Midnight Review) about this very topic. Throughout the discussion he highlights the visual, narrative, and rhythmic nature of sound design in comics. It's a fun talk that you can watch or listen to here.