To my ears the USB sounds dithered to pretend to be 24bit.
The VC must accomplish this post USB transfer.
I think the analogue is nicer and is actually 24bit 48khz, if you switch your DAW to 44.1 or multiples of then its 44.1.
One test I did had the same sound sent via USB and ANALOGUE and going through harsh mega compression, A sound with a reverb tail. The USB one had that digital break up distortion before silence, the analogue one faded into the noise floor.
But for me that was the only time I saw the USB as lesser.
There was a time also when the VC was young and you could put a bit meter plugin on it and it would say 16bit.
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