Q 39

Do spells with a verbal component need to be spoken loudly, or can they be spoken softly (specifically a Cleric's divine spells, but curious as to all spells and whether or not there is a distinction between any of the different types)? Any supporting documentation would be appreciated. The best I have been able to figure in support of one way or another is the Cheat spell, which has flavor text in the Spell Compendium that reads:

"You rattle the dice in your hand and mutter the words of the spell, then check your facedown cards again. The two low cards have somehow become trumps."

However, being flavor text, I'm very reluctant to take that as rules discerning the operation mechanics of all spells.