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If the volume of the sound file (MP3 or whatever) is actually too low you can get audio editing software and boost the volume of that file.
I don't know any free ones. I use a combination of different programs: Sonar; Sound Forge etc.
You can also try to normalize all of your MP3s using audio editing software that supports it (most do) ... personally I dislike normalization but a lot of people like it. It basically makes all of your sound files the same volume in relation to each other AND within the sound file itself. In other words, if there's a quiet part in an otherwise loud song the volume may be boosted for that quiet part.
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