gtk_widget_set_tooltip_text(volume_widget, "Volume");
gtk_widget_set_tooltip_text(balance_widget, "Balance");
gtk_box_pack_start(GTK_BOX(hbox), toolbar,
gtk_widget_set_tooltip_text(volume_widget, "Volume");
gtk_widget_set_tooltip_text(balance_widget, "Balance");
gtk_box_pack_start(GTK_BOX(hbox), toolbar,