The best-sounding harmonies often come from a group of individuals simultaneously harmonizing around a single microphone. While that's not physically possible for the solo home-studio harmonist, one approach is to send your recorded individual harmony parts to a loudspeaker and then mic that up in a room. The same technique can be used to create stereo backing vocals by panning a combination of closely miked and ambient room tracks.
Vocal production in any given culture could be affected by environmental or technological factors.
There are multiple websites that give out information pertaining to vocal booths. Vocal Booth ToGo, Editors Keys, Audio Production Tips, and even Yahoo Answers.
pitch shift
vocal cords
That is something done by your voice, perhaps singing. Scroll down to related links and look at "Vocal sound production".
falsetto : a form of vocal production used by male singers to extend their range upwards beyond its natural compass by limiting the vibration of the vocal cords.
the stages where the air passes through trachea and into the larynx which contains the vocal cords
Glottography refers to the study or description of the anatomical structure and function of the vocal cords or glottis in speech production. It focuses on how the vocal cords move and vibrate to produce speech sounds.
The respiratory structure that allows speech is the vocal cord which is located in the throat. Exhaled air that runs over the vocal cords is what will result into speech.
NO - Not All Creatures On Planet Earth Have "Vocal Chords' - Birds Do NOT Have What Would Be Considered "True" Vocal Chords Like a Homo-Sapien (Human)
A harsh cough or throat clearing can cause trauma to the vocal chords so should be reduced as much as possible. The reason for harsh coughing/throat clearing is usually caused through either thick mucus from dry vocal folds or from over production of mucus as in colds.
The throat is part of the vocal tract used in the production in speech.