A 39
Quote:
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Originally Posted by SRD/PHB p. 174
A verbal component is a spoken incantation. To provide a verbal component, you must be able to speak in a strong voice. A silence spell or a gag spoils the incantation (and thus the spell). A spellcaster who has been deafened has a 20% chance to spoil any spell with a verbal component that he or she tries to cast.
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Unfortunately by RAW this does not say that you have to utter the verbal componenent in "a strong voice", you just have to be able to. So unless someone finds a different quote, it is up to the DM how loudly th everbal component must be spoken.