hi
if by sound manager you mean GUI then consider Pulseaudio.
but you first have to have everything set up correctly by ALSA.
spend some time looking at my alsa howto if you like....because I find most people do not know how to setup their model=string which goes a long way to what sliders you see in a graphical mixer. Or any other alsa wiki.
http://techpatterns.com/forums/about1813.html
2) system sounds .....maybe you do not have pc speaker module loaded?
try this (and my result as example)
Code:
lsmod | grep pcspkr
pcspkr 1434 0
if you get no response you do not have module loaded.
It may be blacklisted or kernel does not have the module
try seeing if kernel has it with
Code:
su
modprobe pcspkr
lsmod | grep pcspkr
Not sure where your blacklisting is ...mine is folder /etc/modprobe.d/