[iforgotpassword]

I don't follow. We have two streams at 48khz, say 16bit. They get somehow interleaved to 96khz, so that must be 16bit as well. If they were interleaved to one at 48khz 32bit, I could see what you mean, one channel would just be very faint noise on top of the other.

[gsich]

See this image: https://i.imgur.com/Mg20l5s.png

Captured with such a capture card. If you play this file you would only hear the first ~20kHz if you are lucky. The 2nd channel is on top. That's my guess, but happy to be corrected. It sounds fine though.