Volume knobs are hardly a mystery to us music-listening folk, though with our music players becoming more and more digital, the presence of a real knob is coming to be a rare thing. Still, even young children have a firm grasp over making something louder or quieter, and when we do this, if we think about what we're doing we're either strange, or into sound (which might be two words for the same thing).
If you've ever explored that strange space in the [extremely limited] menu of your car stereo, you know that you can control your audio settings. It might go by a simple name like Tone Control or something fancy like ESST (Extreme Sonic Sculpting Technology). Whatever those branding wizards decided to name it, you're dealing with an equalizer, or an EQ for short.
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