Now I have sighted assistance and we found what the problem with this
Nvidia sound card handle in final Lucid live CD.
When the boot is finished, the output volume is default muted. We
checked this in gnome-volume control application. Very interesting, in
effects page for example we see the output volume is 100 percent, but
the mute checkbox is checked by default. When my friend uncheck this
checkbox, Orca Screen Reader is talking fine. This problem is not
happened with my another machines with different sound cards, for
example my notebook have following sound card, and Lucid live CD booting
perfect and have sound after the boot is finished:
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)

For example this sound card output volume is not muted by default and
not default checked the mute check box in gnome-volume-control
application. This information help you?

Attila

-- 
[Lucid] When I booting current Lucid daily live CD, default no have volume my 
soundcard
https://bugs.launchpad.net/bugs/567887
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