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Possible Duplicate:
Do you know a simple sound booster app for Mac?
Skype way too quiet. How to get louder Skype audio output on my MacBook Pro?

I came across this question about tools that amplify sound in OS X, but they're not free.

Are you aware of a free tool that boosts the volume?

Community
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Louis Waweru
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  • @daviesgeek there aren't any editable settings in Audio Midi Setup. – Louis Waweru Oct 04 '12 at 02:43
  • Making Skype louder is a very different question than making all system volume louder. Not a duplicate. Even if some of the answers answer both questions, that doesn't make the question a duplicate. Otherwise, every question that could be answered "reboot your computer" would be a duplicate. – Daniel Oct 04 '12 at 04:13

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If you're happy to get your hands dirty and you're a registered Apple Developer, you could use Soundflower to pipe your system audio into AU Lab (search for AU Lab on the ADC Downloads page) and push everything through Apple's own awful AUDynamicsProcessor Audio Unit.

colons
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  • hmm, well then, why not just plug the system's audio output into an audio amplifier. I have my system piped to my stereo system. I can regulate sound through the receiver. – ICL1901 Oct 04 '12 at 22:54
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    The only reason I can concieve of that you would want to boost system volume is that you're on the build-in speakers (or some little passive speakers) and the only volume control you have — the system-level one — does not go high enough. If post-system amplification was an option, this question would not have been asked. – colons Oct 05 '12 at 01:44
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You might want to look at Audacity. The link is to the features page. The app is hosted on Sourceforge. (download link).

ICL1901
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    Audacity can amplify individual audio files but would be useless for amping up system audio. – colons Oct 04 '12 at 16:29