@Zaine, I considered a lesswrong post on it, but it is very difficult to give general advice on the topic due to interactions between identity and voice, the fact that many people already use many techniques and so could get bored with a list, etc etc. How would you advise structuring such a sharing post?
I would identify a representative set of specific circumstances which would benefit from 'vocal training techniques', then go into detailed explanation of the physiological changes that effect a benefit in each specific circumstance. Now that the generally applicable part has been covered, you can detail various techniques designed to achieve the effects. As each person will have differing degrees of success with different exercises, list many, but at the outset state the ultimate goal for the technique the set of exercises are designed to develop, exemp...
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.