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I am confident that having no headphone output except at 48k causes the conflict

I think so too.
Do you have the latest M4 drivers?
Just asking, not suggesting you get those. Do you have any MOTU drivers installed, or are you using system drivers?
If you do have them, are they recent?
You mentioned a new computer, so ...

Last edited by rharv; Yesterday at 08:34 PM.

I do not work here, but the benefits are still awesome
Make your sound your own!