Brawlbox can't open sawnd files but can open brtsm. However, I'm not aware of any way to alter volume with brawlbox.
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I'm not sure how much you know about audacity, so I'm sorry if this next section is unneeded..So with audacity you'll want to first try out the compressor and see how that works for you. The reason for this is that you can use the compressor to increase volume without any clipping noises. However, its abilities are limited.
http://wiki.audacityteam.org/wiki/CompressorIf that doesn't do enough then I guess use the amplifier. In order to amplify up the volume you'll need to click on the box "Allow clipping."
