Why do they even include settings by default which introduce crackling and hissing noises?
I found that even starting with resample.quality = 7 I couldn’t hear any difference, younger people (like teenagers) might be able to distinguish 8-9. Maybe use 8 as a default value?
Use PulseMeeter, you can do a simultaneous output with it. It’s basically the Linux version of the VoiceMeeter Banana program for Windows.
FWIW, I get the same error, in text form for discoverability via search engine: