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In this case do the following:
If you want to set your sound perfectly (in case of 5.1) then do this one:
$ su -
Configure bars with arrows, enable or disable service with "m" key.
wave, wave center, wave surround, center, surround, PCM=> All the way UP
AC97=> Down, down, down. and stay down
ALL LFE=> Down, down, down. and stay down
Master=> 75% Up (check if it's ON)
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.
Originally posted by Tormented This is incorrect. LFE stands for "Low Frequency Effects" and is the channel that controls your subwoofer.
On a 5.1 system only turn this off if you don't want any bass at all.
It's correct according to Asus E1292 User's Manual
(sorry can't support the scan of it s)