@the other dave, those are excellent for singing and, when actively used, social situations, but there are other techniques which are more passive. The Khargyraa, Tuvan, Diaphragm Breathing, Nasal Passage Opening, and some more general speech techniques including speaking slowly, pausing often, knowing when to gesture, all of these contribute more effectively to your impression than the techniques you mention, which fade as soon as you get caught in the moment.