Implicit sample rate conversion or drift correction?

I’m playing through a stereo stream from an external USB device to my internal built-in output on my MacBook Pro.

This works very well… a little too well actually.

Theoretically without sample rate conversion or drift correction this wouldn’t work without glitches, click, cracks or buffer overflows/underflows.

So my question: is there any implicit sample rate conversion of drift correction going on?

Side notes:

  1. Not using aggregate device
  2. Same sample rate on both devices (obviously)
  3. Devices not word clocked to each other (obviously)
  4. Mac OS X 10.11
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I’m experiencing this problem and I think it’s caused by the AudioIODeviceCombiner not correcting for clock drifts. So I think there’s still an issue in there.