I hear Distorted Orca speech after login in 10.04

[Hammer Attila]

Dear List,

My desktop machine have following integrated sound card:
00:07.0 Audio device [0403]: nVidia Corporation 
MCP72XE/MCP72P/MCP78U/MCP78S High Definition Audio [10de:0774] (rev a1)

When my installed 10.04 system is logged in automatic and Orca is 
started, I hear Orca speech with an interesting distorted voice, and if 
I press a key, I hear a low echo voice.
This is happening I think 10-15 sec, after this Orca works fine.
I using speech-dispatcher with Pulseaudio.
Possible this problem is a buffering issue, or bug in Speech-dispatcher 
new Pulseaudio driver?
If Orca is not running, for example music playback working fine.

I see similar problem some time with following type sound card my notebook:
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio 
Controller (rev 03)
My notebook the problem is smaller:
When First launching Orca, some time I hear a very shord distorted 
voice, but the speech is clean understable.
Pulseaudio and Speech-dispatcher running my machines factory user based 
session, not system vide mode.

Anybody see similar problems?

Attila