I'm no expert on
Disneyland's Pirates (having only ridden a handful of times - but adding to that in a week and a half), but I have ridden WDW's at least 100 times. So, I'll take a shot at this question.
I think you are asking about one of two different brief speeches. The first comes before the first of the two drops, and is in a raspy voice that goes something like this:
"You come seeking adventure and salty old pirates, eh? Sure, you've come to the proper place. But keep a weathered eye open, mates; and hold on tight, with both hands, if you may. There be squalls ahead, and Davy Jones waiting for them what don't obey."
Then, as you are travelling through the last tunnel before the battle scene (at WDW it's right after the splashdown - so it is very hard to hear) you hear (in the same voice, but louder and echoing):
"No fear have ye of evil curses, says you? Ah, properly warned ye be, says I. Who know's when that evil curse will strike the greedy beholders of this bewitched treasure."
Followed by what sounds like a very old, and frail pirate who states:
"Perhaps you know too much, You've seen the cursed treasure. You know where it be hidden. Now procede at your own risk. These be the last friendly words you'll hear. You may not survive to pass this way again."
I hope I got that right. If I didn't, I'm sure someone can correct me.