[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" "on"
Simple mixer control 'Audigy Analog/Digital Output Jack',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [on]
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" "1"
amixer: Invalid command!
[baz@localhost ~]$
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" 1
amixer: Invalid command!
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" on
Simple mixer control 'Audigy Analog/Digital Output Jack',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [on]
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" ON
amixer: Invalid command!
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" 1
amixer: Invalid command!
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" 'ON'
amixer: Invalid command!
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" 'on''
> on
> ^C
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack"1
Specify what you want to set...
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack"
Specify what you want to set...
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" enable
[baz@localhost ~]$ amixer -c0 set "Audigy Analog/Digital Output Jack" "on"
Simple mixer control 'Audigy Analog/Digital Output Jack',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [on]
[baz@localhost ~]$