Adjusting audio levels

Hi
I'm working on material where the footage has been filmed by different people and (lucky me), the audio levels are not consistent. On a particular one, the sound level on the camera was turned down so low (I presume) that after capturing, it is barely audible. (and no, there is no chance of refilming the footage!)
I have whacked up the level within FCP but this is obviously causing me problems because you can hear that buzzing noise (dont know the correct term!) that you get when you turn the volume up of something.
I have sort of tried to apply the audio filters here and there to see if it makes any difference but because I'm unfamiliar with terms like frequency, band width, gain etc, I don't know exactly what should be adjusted.
Any ideas would be really useful
Cheers
Jenny x

If you are using FCP 5, then you should take advantage of Soundtrack Pro. You can boost audio levels (normalize) and remove ambient noise/hum/etc.
You can get a taste of how to reduce noise in the STP Quicktour:
http://www.apple.com/finalcutstudio/soundtrackpro/quicktours/noisereduction.html

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i david:
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:)Sue

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Hi there - I'm using the trial version of CS6 and will almost certainly buy it. I've watched lots of the video tutorials but am stumped on this simple issue!
1. Let's say I have a clip and I want to increase the audio level part way through a clip.
2. In Example A below I have added a keyframe at the point I want to change the volume.
3. I then went to the audio mixer and increased the volume level using the slider. But nothing changed on the clip.
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i david:
Welcome to discussions!
Highlight the audio (it will turn purple) by clicking on it.
Then check the edit audio box and use the "100 %" slider to your liking. Be sure to uncheck the edit audio box when you are done.
:)Sue

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To elaborate on what Max advised (also available through Modify->Levels), you have two choices for a gain level changes: "absolute" and "relative."
A "relative" adjustment will change the levels relative to where they are now. For example, the current gain level is at 6db then keyframed to 9db over the course of a clip. Making a relative adjustment of -4db will result in the gain levels being set to 2db at the first keyframe and 5db at the second keyframe.
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-DH

Adjusting audio levels

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