With F7, when the logon screen was presented, my choice of system ready sound-clip was played. This was setup along with the other sounds for error, login, logout, etc...
With F8, the logon sound-clip is never issued, but all the other sounds are present after logging in as a user.
I have not discovered how to repair the problem. The settings are in the same menu paths for each distribution. Default logon session is Gnome.
Looking forward to a recommendation.
Leslie