I connected my android phone via bluetooth to my laptop, which is connected to good speakers. I have multiple soundcards. In plasma volume control, the phone only is displayed as a recording device. So I cannot route it to a special sound card. In pavucontrol it is displayed as a loopback playback device, for which I can select the right sound card. Something like that should also work in kde.
Created attachment 109195 [details] Plasma Volume Mixer 1
Created attachment 109196 [details] Plasma Volume Mixer 2
Created attachment 109197 [details] PavuControl
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Since I use Pipewire in the meantime behaviour changed, and it works better. But the phone device is only shown as "Wireplumber [export]" instead of "Wireplumber [export] : my phone model" like in pavucontrol.