@lxpanel --profile LXDE
Do you think disabling this will make any difference?
Don't play with this.

Please start again the alsamixer as within your posting #28 => use F1 to read the "Help" => move through all the controls => if one is red => decrease the value of this control. Exit with [Esc] and save the settings with
Code:
su
alsactl store
Go to the Menu => Preferences => Default applications for LXSession => Autostart => type "alsactl restore" (without " ") and use the Add-button

Reboot.