Audio is too quiet--can it be amplified?

I occasionally download YouTube videos that have to do with history, for my history class (I'm a teacher) and I string them together and edit them in Final Cut Pro 5, then use iDVD to burn them to DVDs to show in class. Of course, the video is often lousy, but these are throwaway one-time-use videos anyway, and the narration is often more important than the picture.
But sometimes I have a problem with the soundtrack of the video being too quiet to hear well, even with the audio volume line raised to the max in the timeline.
Is there any way that I can raise the volume of these audio clips further in Final Cut, using an audio filter or something? I looked at all the audio filters in the menus, and I can't figure out what most of them do. I don't see any with "amplify" in their name. Can it be done somehow?
Thanks for any help.
Tom

Hi Tom,
An instance of the Compressor/Limiter filter will help to reduce the dynamic range of the clip ...
Select your clip in the timeline, then choose Effects menu > Audio Filters > Final Cut Pro > Compressor/Limiter, then double click the clip to open it into the Viewer window. Now click the Filters tab in the Viewer so that you can adjust the filter settings. For your needs you'd probably want to first check the "Preserve Volume" checkbox, set the Ratio to about 10, then progressively reduce the Threshold until you achieve the desired level.
By the way, when you play with audio filters its usually going to be necessary to hear the effect of the changes you're making in the filter in real time, right? So you'll want to be sure that you are playing through the clip in the timeline whilst you make these changes ... you might also want to loop that playback if its a short clip. An easy way to do this is to position the playhead over the clip and then press "X" to mark an In and Out point at the extents of the clip, then press "Control L" to toggle "Loop Playback" mode, and press "Shift Backslash" to "Play In to Out" ... the clip should play continuously now whilst you mess with the audio filter parameters as necessary.
Hope it helps
Andy

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