I have this volume icon in Tint2 that is original from the openbox install. As you can see it is a bit “complicated” with sever, modules, etc. I dont want this.
I had an issue way back when I actually used a taskbar with openbox with the volume icon and this is what I had to put in my autostart (~/.config/openbox/autostart) to get it to work correctly for me (command below does depend on pulse audio) sleep 1; (pasystray) &