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US-224 A/D converter question

Hi all. I bought a used US-224 for a few bucks just to give it a whirl and it seems pretty cool. It has 24 bit A/D converters (64 times oversampling), but I'm not sure of the quality (I'm guessing not very high because you can find these things for less than $130). I'm wondering if I get a decent preamp to stick in front of the US-224 if it will make much of a difference in sound quality?