here is a link to the panel.conf file, which gets installed with "manjaro-lxqt-basic-settings" package (which i never install on my systems):
as you can see, the volume applet is configured to use alsa and alsamixer (installed with the "alsa-utils" package) by default. if you install pulseaudio with pavucontrol-qt (as you do when you select all packages in the GUI installer), the audio applet/widget will probably not work out of the box. but you can easily configure that by right clicking on it.
what do you think we should change?
- remove the possibility to install pulseaudio and pavucontrol-qt
- adjust the audio/volume widget to work with pulseaudio and pavucontrol-qt by default (which brakes its compatibility with alsa)
- maybe the installation of pulseaudio-alsa package brakes compatibility of the volume widget out of the box. @artoo, do you know, whether this is the case?
you can also change that in "preferences" menu entry of pcmanfm-qt. no need to edit a .conf file. i actually like this default setting. @artoo has created the .conf file for that setting. thanks!
there is a check box to add "base-devel and yaourt" in the GUI installer. you can even choose to not install single packages from base-devel group to make your install even lighter!
you probably missed it. but you easily install it with "sudo pacman -S base-devel yaourt" in case you forget.