Yes, i am referring to your normal speaking voice. Khargyraa and Tuvan techniques in particular add undertones to your normal speaking voice, making it seem deeper and more resonant when the exercises are performed regularly. It is not that your 'normal voice' becomes more resonant, but that the concept of 'normal voice' is actually based on a combination of vocal chords and you simply add to the mix, increasing the apparent depth and resonance of the timbre which the brain sums the voice into. In short, yes, I am referring to normal speaking voice, though it also allows some fun things when singing. Like metal screams without injuring vocal chords, at any register.
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.