Here is a video to demonstrate the problem:
https://www.youtube.com/watch?v=p_kor8I2qhg
This happens constantly in all applications. It really sounds like the card is trying to switch sample rates or something. It also halts the whole system, it's not just an audio chug. The frame will also chug.
I tried every possible sample rate, always the same tearing and system chugs.
The weird thing is that you set the bitrate (16/24/32) from windows but the sample rate has to be set on the Duet control panel?
Perhaps there's some collision?