Learning to become an accomplished and knowledgeable audio engineer is an enormous undertaking. While we’re lucky to live in the age of the internet, where so much information is available for free, that information is not always presented in a form that allows us to make the best use of it. Spend time on YouTube, for example, and you’ll find a wealth of video content aimed at those who want to master the art of mixing, yet a lot of it is inaccurate, misleading, out of context and inapplicable, or simply incompatible with your own experience and what you’re attempting to do in the studio.
So that’s why when the “Jello dries up,” so to speak, it makes it very difficult to make fast vibrations, thus resulting in the inability to hit higher notes, cracking, or the inability to produce any sound at all. Moral of the story: Hydrated vocal folds are happy vocal folds!