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I'm often victim to some loud sound playing on my computer all of a sudden when I have my volume level turned up already to watch a quiet video. I can't turn everything down to the level of the quietest video I will ever watch; that's impractical. I can't even control the volume level of some applications.

Is there an audio proxy or some other plugin that can limit how loudly a sound will be outputted from my built-in audio card? I'd like an audio output level limit control in addition to the system volume control. For example, if I have my volume up all the way to watch a quiet video, any loud sound that plays should sound as if my volume is set to half or something. I've got my Mac connected to external speakers with an analog 1/8" cable.

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    I was about to ask a similar/same question but a quick search found yours... from 2014! Did you ever find a solution? I wouldn't care if it altered the "experience" somewhat - it could temporarily mute or even pause the video or audio in my browser or viewer, as long as I could be sure it would stop/block a sudden increases in sound level. – uhoh Aug 25 '18 at 18:14
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    @uhoh I didn't, but I also didn't try very hard myself. There is Soundflower that acts as both an audio input and output, piping from the input to the output. There's probably some other tool that could take the Soundflower audio input, apply the normalization, then output to wherever. But it might be clunky unless you program a little menu bar app to do it. 2014... back then I didn't know any of that stuff; I was a kid graduating from high school instead of a Google engineer! – sudo Aug 26 '18 at 2:56
  • I really like that idea! My programming skills are limited to Python, but maybe there is still a way... – uhoh Aug 26 '18 at 3:00
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    @uhoh You could probably rig something up through GarageBand as a first pass just to test the rest of the pieces. I'm not familiar with any of the libraries for handling audio... except for in Java, bleh. I'd probably give it a shot if it were a more important problem. – sudo Aug 26 '18 at 3:18
  • Thanks again. There are certainly lots of people in the world in my not-exactly third world situation; it's hot so I have a fan running 24/7 so need to keep volume high enough to hear the quiet moments (especially people who dramatically modulate their spoken volume in order to sound "interesting") yet the walls are thin and/or windows are open so loud sounds disturb neighbors late at night. I'm "boxed in" in terms of acceptable sound levels. However these people are less likely to actually go out and pay for an app. Oh well, thanks! – uhoh Aug 26 '18 at 3:39

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