Playing youtube videos makes pulseaudio switch to 48000hz, which cannot be disabled in my case by configuring /etc/pulse/daemon.conf for some reason (run pacmd list-sinks to get sample rates). This change of the sample rate makes the interface go quiet for 2 seconds. It can be avoided with jack2 (jack works as well probably), cadence and the pulseaudio-jack bridge alsa - Pulseaudio detects wrong sample rate. Forcing pulseaudio a sample rate - Unix & Linux Stack Exchange
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