What I should have added to my previous post is… of the standalone part of prime4 (computer) has seized control of the sound card, the sound card is then dedicated solely to standalone. If you power off the prime 4 and power it up in computer mode (not standalone mode) then the standalone part doesn’t try to seize the soundcard, it lets the laptop seize it instead.
Before someone yells “ah wait, the mc7000 could let two laptops seize the mc7000s soundcard”… take a look at the specs and advertising for the 7000 … it says it features dual sound cards (plural)
And the 8000 being able to let the soundcard be seized by laptop for a couple of channels and let standalone use two others? The standalone bit inside an 8000 wasn’t a computer and may (I’m guessing ) have had it’s own “standalone” method of getting audio to its audio channels