“Volume” is for output, “Gain” is for input.
Not every input is equally loud. A plug-in microphone, a USB headset, a webcam, will all have slightly different levels, which means the input will vary.
One might be really loud, so your voice is blaring, and volume goes from 0%-120%. One might be really quiet, so you’re barely heard, and volume only goes from 0%-60%
In these situations, you use the gain to turn that particular input up or down until the level is where you need it to be, equal with other sounds, so that you have the full 0%-100% of the volume range.
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