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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?

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marked as duplicate by daviesgeek, Lri, Stu Wilson, CajunLuke, jmlumpkin Oct 4 '12 at 23:25

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
@daviesgeek there aren't any editable settings in Audio Midi Setup. –  Louis Oct 4 '12 at 2:43
    
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 Lawson Oct 4 '12 at 4:13

2 Answers 2

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.

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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. –  David DelMonte Oct 4 '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. –  Iain Dawson Oct 5 '12 at 1:44

You might want to look at Audacity. The link is to the features page. The app is hosted on Sourceforge. (download link).

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Audacity can amplify individual audio files but would be useless for amping up system audio. –  Iain Dawson Oct 4 '12 at 16:29

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