we keep going round in circles. way back you started by saying you didn't like the Windows 10 sound. now after resetting the laptop you say "In both cases, the noise as per the previous videos is now gone."

so BIAB seems to work fine on both but you don't like the sound on Windows 10. headsets work fine but plugging into a speaker system gives a flutter. sounds like the speaker setting on the laptop isn't working right or your speakers introduce the noise and the fault is there.

and you haven't tried using the behringer driver and the behringer unit audio output which would cut out the laptop's internal sound totally and if it works give you high quality audio.