Well you have do more than read about the solutions. To help us to help you please:
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Tell us what you have done so far.
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Post what pipewire and pulseaudio packages you have installed.
Use
rpm -qa | grep package_name
.
Note for all Rock/Lx 4.3 users: To switch from pipewire sound server to pulseaudio sound server see "“Pipewire sound server” in OM Lx 4.3 Errata.