Many moons ago I tried to get a Soundblaster something to work with a Mac. It worked, as long as you kept to 44.1 kHz, 2 channels. Once you used more channels or higher sample rates, it ran out of sync, resulting in small dropouts. It was class compliant, but not entirely.
It seems it's behaviour hasn't really changed.
Have you tried if the outputs work? Discrepancies between what's reported and what's possible aren't unusual.
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