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.