Has anyone been able to get SRGB to work with a dedicated USB DAC?
What exactly do you mean?
I use 2 USB DACs regularly and switch between them while SignalRGB is working, no issues.
Interesting. If I have the DAC selected, none of the Audio Visualizers work. However, if I select the Realtec (on board sound) then they kick in.
You can switch the input device in the Audio / Capture settings in SignalRGB, usually this is set to “follow system default” which might need Signal to be restartet if you changed the device in Windows while Signal was running.