Could you help me with the syntax?

When I do

$ amixer -c 0 -- sset Master,0 playback unmute 100%

I get:

Simple mixer control 'Master',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
  Playback channels: Mono
  Limits: Playback 0 - 255
  Mono: Playback 255 [100%] [0.00dB] [on]

however

$ amixer -c 0 -- sset 'Digital Source',0 playback unmute 100%
amixer: Invalid command!

What is the proper way to select the (multiword) mixer device?

Also, shouldn't the correct device be selected automatically?

-- 
[CA0106 - CA0106] ALSA test tone not correctly played back
https://bugs.launchpad.net/bugs/671178
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