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There is, perhaps, a more salient question to ask. When did you last have the coolant changed? You see the water pump seizing up is a much more likely scenario to snap the belt than is the belt to just fail on its own. The coolant is important to have change every five years or so because it keeps the pump lubricated and seals supple. The coolant does break down over time and will not lubricate as well as when new. Being in hot Florida, your belt has seen some pretty high temps over the years. I do not think you are in any immediate danger (depending upon coolant change frequency) but you should probably be saving your pennies for a timing belt and water pump replacement within the next several years.

Failure of the ML amp in the LS460s is pervasive. Owners in other forums have reported getting their failed amps repaired by United Radio - http://www.unitedradio.com/automotive/ - for about $350.