Any good guide or video explaining vocal modes & realistic usage?

I’m not a vocalist, so I’d love to better understand how vocal modes in Synthesizer V work — especially how they interact or complement each other.

Is there an article or YouTube video that explains this clearly? For example, when automating things like Mouth Open, Airy, Belt, etc., how should I use them on a group of notes to make the performance feel natural, like what a real singer might do?

Appreciate any recommendations or tips!