Heartbeat sound suddenly quieter!!

I put the heartbeat sound from imovie effects into my film and it was fine: I could adjust the volume within frames etc. and it played back perfectly. But I just watched it for the sixth time and suddenly the heartbeat sound is very quiet. I have all the volumes I can find turned all the way up. Not only that, but it is also very quiet when it is played FROM THE MENU. That is, when I double-click heartbeat in the menu, the volume is very low. Everything else is nice and loud. ***?!? This is messing up my film, and I cannot find a way to adjust the volume of this one sound effect. Please help!!
ibook Mac OS X (10.4.5)
ibook Mac OS X (10.4.5)

Here's what worked for me. It's not a workaround, this acutally solved the problem and I haven't had speaker issues since.
Go to "Activity Monitor" (you can hold "Command" "Shift" and press "U" if you're on the desktop).
Locate "coreaudiod" under "All Processes"
Right click it and click on "Quit"
After several seconds, "coreaudiod" will restart on it's own and your speakers will return to normal.
I tested this by restarting to see if it was a fluke workaround. Then I turned it off and waited a day (I had things to do so the waiting a day was easy lol). Turned it on, it was fine. I put it on sleep mode, waited 10 mins. and took it off of sleep mode. It was fine. Everything went back to normal for me.
Let me know if this worked for you.

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eric. [email][email protected]][email protected][/url]
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