I want to play audio in my project. 
First, I used mplayer to play with "system()", it worked great but I need to 
make a new process to do that.

After that I want to use Qt function(based on pulseaudio) to do that so I 
changed the configuration so that the pulseaudio could be opened when the 
system started up.
But when I changed the volume in Qt function(QSoundEffect), the voice was 
mismatch with the volume I set.
Then I used mplayer to test again with different( -af volume=[ -20, -10, 0, 
10]), I found the voice would be the biggest if the volume is bigger than -10 
(within -10).

So how can I solve this problem? 
( I also send mail to pulseaudio )

Best Regards
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