How can i get login sounds
 

I am a ubuntu user.initialy it gives login sound and shut down sound.But since recent it doesnt give them.after loging ,it doesnt give any sounds.When i go to ,alsamixer the Maseter sound indicate as ziro and i have to increase the sound by alsamixer.I have to do it each time log.Since i am new to Os i am hang around it frequntly and my change some configeration.How can i correct it.

I don't know anything about ubuntu, but I would say try something like:
after adjusting the sound volume to the preferred level. This command saves the current volume.

System--->preferences---> sound--->sounds