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It's normal for that unit cause it's a crappy design. That preamp has about 10 dollars worth of parts in it if that and the big flaw is the fact they don't know how to design preamps. The design calls for a reverse gang pot and if you used a reverse gang pot you would get a linear volume curve, but reverse gang pots cost money to make and aren't available in small quantities or normal values, so they just used a normal pot and that's the reason you get the weird swing of gain in the pots rotation.
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