Created attachment 112905 [details] screenshot In the attached screenshot of the kmix Mixer dialog you'll see that I have 2 playback devices, one being internal audio, the other a headset connected via bluetooth. Also in the screenshot you see that I have configured kmix to display the playback devices sliders in the panel popup, but opening the popup only shows the internal device but not the headset.
I'm very much in favour of this. I frequently listen to music using a bluetooth speaker, and I want to be able to quickly adjust its volume without having to change the master channel or open the mixer dialog.
Yes, this is a problem. The reason is that within KMix only the master channel of each device is shown in the popup volume control. This is fine for ALSA/OSS, but for PulseAudio all of the hardware devices are considered to be one sound card "Playback Devices", and only the master channel from that is displayed. The ViewDockAreaPopup needs to look at all of the MixDevice's of the Mixer, instead of just the master channel.
This has now been implemented (since commit https://invent.kde.org/multimedia/kmix/-/commit/29a69dc2). All PulseAudio playback and capture devices can be individually selected to display in the system tray popup.