How to set channel balance in amixer?

alsa-project/alsa-utils issue #73 was opened from quantum-booty:

When I change volumn using keyboard media keys, the left and right channel becomes imbalanced.  I currently have this mapping in i3, I would like to add command to balance the channels after I change the volumn. bindsym XF86AudioRaiseVolume exec --no-startup-id "amixer set Master '5%+,5%+'"

Issue URL : https://github.com/alsa-project/alsa-utils/issues/73 Repository URL: https://github.com/alsa-project/alsa-utils