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I've never owned a headphone amp before, so please excuse the stupid questions, but what does the button do to the left of the line in input? Also, what could the line in input be used for? Thanks a ton.
No such thing as stupid questions.<br /><br />The button to the left of the input is the gain button. It is between 2x or 6.5x gain. If you don't know what gain is, a simple explanation is it makes the music louder without distorting it.<br /><br />Most of the time I would assume most will be using the USB input in the rear of the amp, but if you want to use another DAC, you can plug it in via the 3.5mm jack.