V90/XC90/S90 HK AUD .VBF Files

[spacemanspiff]

The HK system has 2 channels on front each door high + (mid +high). If the HP system has all 3 speakers in parallel that might be the reason why you don't hear it. 
Second, you should change the configuration high performance plus for HK AUD.  
Third,  as far as I know; except some variants,  the high performance audio does not have center speaker on the dashboard.  (not the small speaker), you might need to wire it too.

I made all the wiring changes and speaker additions. But for some reason only the center speaker makes system noises, e.g. turn signal, parking beeps, etc. My understanding is that the front door speakers should also contribute to system sounds though.

I've already changed 028 to high performance plus.

Should I try changing 451 / amp level, 460 / speaker count, and 466 / amplifier variant?