A/B switch works flawlessly. No problems there.The problem/weird issue lies with the volume knob. You'll read other reviews that say the same, but I'm experiencing something different. I have a Dragonfly USB DAC + AMP connected to my PC, then the aux comes out to the input of the MC102. Then it splits into two sources. Unlike others, it seems as though my volume knob works --- I do not have extreme changes in volume with small movement, but actually the opposite. PC is on 100% volume, but when I turn it to the MIN, there's still sound coming out. Then I turn all the way up to the MAX and its honestly not that much louder. So this kind of changes/attenuates sounds in the middle, and only so slightly that I can barely hear a difference between a quarter turn and a half turn. Past 3/4 of the dial it starts to increase volume unevenly between the left and right channel is which is very strange, and unacceptable honestly.So there's my review.I did not have to remove any resistors like others have had to, but this unit could work a whole lot better. I have the version with 4 outputs and that one works perfectly, so I'm not sure what they did wrong with this one.
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