If windows allows it splitting the audio to different devices would be a great improvement.
I would like to be able to:
All at once of course
Is possible in indievolume.com and chevolume.com - and freeware AudioRoutere
I've played with these apps and none of them work reliably, which speaks to general app compat. We'll keep looking into this though.
This is something I would be interested in this as well
I would pay for this function,
CheVolume is bulky and not practical, all the rest is useless.
i really like eartrumpet, its a real lifesaver for me.
if anyone seeing @MortenManden link don't touch it, this link is a trojan so beware

Seems I've been hacked - have just updated my password - and deleted the spam-post!
Now available in EarTrumpet 2.0. Grab it from the Microsoft Store (https://www.microsoft.com/en-us/p/eartrumpet/9nblggh516xp)
Most helpful comment
I've played with these apps and none of them work reliably, which speaks to general app compat. We'll keep looking into this though.