Audio problems are common place in video editing and there are programs such as Soundtrack Pro
In Final Cut Pro, you can double click on the audio track in question and in The Viewer window, you can click and drag the levels bar to raise the audio. You can also type in a numeric value to the right of the slider. Now this is simple and great, but it only lets you raise the audio a maximum of 12db. Sometimes this just doesn’t cut it.
A quick and dirty work around for this is to click on the audio track and make it a nested sequence. You can do this by pressing Option + C, or by going to Sequence > Nest Items. Final Cut Pro will then ask you to name the sequence, I usually name it something like ClipName_audioBoost. Then your clip will be replaced by a nested sequence.
You can then edit the audio of this nested sequence by holding down the Option key and double clicking on the audio track. It will open up in the Viewer just like any other audio track and you can boost the audio by another 12db. You can use this technique as many times as you need in order to pull out all the audio you can.
All that being said, it is best to try and use a boom mic on location and record the best possible sound you can. Raising your audio levels again and again will lead to noise and distortion after a while. If you have any audio boosting tips, please leave them in the comments!
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