If you want to set your sound perfectly (in case of 5.1) then do this one:
Configure bars with arrows, enable or disable service with "m" key.
When done ESC
P.S. If you have 5.1 speaker system, be sure that LFE channels bars are all way down and [off]. LFE channel is to generate 5.1 emulation matrix on 4 speaker systems.
After running this command (alsactl store) your custom swill be stored in alsa configuration and restarted automaticly every reboot.