HI Mat
Normally you get this hd sound driver for when the hd monitor is connected to the system by a HDMI lead , and as such it is part of that driver.
As they assume you would want your sound and video to come from the same location for movies etc,
I get over this in w7 as below
This gives me the following behaviour :

If the AKAI audio interface is present and switched on at win start up this will be my default. as in pic.

If the AKAI is not present or off, but the HD monitor is in use that comes up next instead.and the sound comes from the 32” monitor.

If I am using the laptop away from my set up say as a portable, as neither the AKAI or the HD monitor is in use it falls through to the on board sound card and laptop speakers.
As a standalone.
All the above applies to the windows side of things

However I do have to make sure that BIAB knows which one I am using at any time
As obviously it remembers my Audio settings and drivers.
The same is true for most of my other music software unless it relies on using the current windows driver in use.
Just my thoughts
Mike

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BIAB2021 UltraPlus,AsusN55S1Tbssd, W10/64,Akai EIEpro
Yamaha CVP405,SquireStrat, CoolsoftVMidSynth
Novatation Impulse61 Ctr kbd, Cwalk blab Kontakt

http://mikesmusic.byethost16.com/