Did you know about this?
Hold down Option and Shift while pushing one of the volume-change keys on your keyboard and the volume will adjust up/down in 1/4-step increments.
h/t AppleInsider
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Works for brightness as well 
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Ha. I’ll be darned… I wonder how long that’s been part of OS X.something.
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A long time. I first switched from Windows computers to Macs and OS X in 2007 and I remember reading this tip shortly after I bought my first MacBook.
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Frankly, I’m a bit surprised this is not better known. I use this all the time. In the past mainly for brightness, nowadays more for audio when I’m watching video content. I guess my aging ears make me more fussy when it comes to volume.
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