Yes, here are two videos to show you how to setup Interactive [On-Off], and another video for HDMI-DP. Once you have applied the HDMI-DP edit, restart your computer.
To trigger 'External Speakers', you need to select the analogue speakers, then switch back to HDMI-DP, same for Interactive [Off] and SPDIF.
Watch "Interactive [On-Off]" on Streamable.
streamable.com
Watch "HDMI-DP" on Streamable.
streamable.com
Multichannel enables freely without the 'External Speakers' trigger. Simply restart the services.
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My Z906 turns 5.1 or 7.1 input into virtual for headphones, including digital, all I do is plug my headphones into the port on the side.......
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Dim, there is indeed a bug with Sound Unbound, and enabling spatial from multichannel, for me Ultra still displays multichannel mode, yet spatial is on and Windows shows stereo.
For me it does not create an issue, but perhaps with your ALC, plus the issue, you get some sort of feedback, I do not know for sure, I get nothing with the bug.
Unfortunately fixing it is out of my hands for the time being, there is an update for SU but it does not yet work with the modified drivers.
Setting the speakers to stereo first, prevented the issue, Ultra properly goes into stereo, then enable spatial.