@WP31 Hey did you resolve this? Thinking of buying the soundbar for the U3223QE monitor I recently got.
Another question: can you control the volume of the soundbar with the Mac Fn keyboard volume buttons? What if you use MonitorControl app?
So I couldn't get to change volume from my apple keyboard. Recently got the U3223QE, and my computer set up (soon to be updated) is a Late 2012 Mac mini i7/16GB/512 SSD+1TB HDD (connected on the Mac mini via miniDP port with an adapter to a full size DP to the DP on monitor) and a 13" MacBook Pro 2019 Two Thunderbolt 3 Ports 16GB (connected to the monitor via the USB-C cable that came with the monitor to the USB-C 90W port).
I have a set of speakers plugged in through the 3.5mm port into the U3223QE. I could not get either computer to control volume via the keyboard Fn buttons (or the TouchBar on the MBP).
I tried MonitorControl and Lunar -- both got the keyboard buttons to work, the MacOS little grey box would show up showing me adjusting the volume, but the sound loudness from the speakers would not actually change. I did not try BetterDisplay.
I came across
Proxy Audio Device and this has fixed my issues, I can now control the sound via the keyboard buttons.
If there's a better or lighter solution, I would appreciate hearing about it. I don't think I needed the other features being offered by MonitorControl, Lunar, and the untested by me BetterDisplay, as I don't know what use I have for adjusting the U3223QE monitor brightness, as I usually have it set to the same thing no matter what -- am I missing something here?
PS: Primary use for the computers are: 1. Office work; and 2. Photo Editing (LrC, PS, some Lr).
This monitor replaced my trusted Dell U2412M that I've had for a decade or more. There's also a second 24", currently a P2419H, from work, connected to the mini.
PPS: Desperately trying to decide which Mac to upgrade to. The Mini has been my workhorse, on 24/7/365 since purchase in Nov 2012. The MBP is something from work. Can't decide whether to get a new mini M3Pro 16GB or a 14" or 16" M3Pro MBP to use as my new primary computer.