I think I have Alsa driver installed. Pulse not working may be I dont have it installed. Not sure If I can run Pulse and Alsa. I had to configure each application prior to work which use pulse.(SMplayer by default select pulse. I had to change that)

I know a little about these. So if the question is stupid then please help me.
Smplayer always showing a cross(x) icon in front of speaker icon as it is disabled, though Im playing sound.