Just in case anyone else has this problem, I have 'fixed' it. I needed to set 
'IEC958 Playback AC97-SPSA' from 3 to 0. Thus : 

[EMAIL PROTECTED] ~ $ amixer get 'IEC958 Playback AC97-SPSA' 
 Simple mixer control 'IEC958 Playback AC97-SPSA',0 
   Capabilities: volume volume-joined 
   Playback channels: Mono 
   Capture channels: Mono 
   Limits: 0 - 3 
   Mono: 3 [0%] 
 
 [EMAIL PROTECTED] ~ $ amixer set 'IEC958 Playback AC97-SPSA' 0 
 
 [EMAIL PROTECTED] ~ $ amixer get 'IEC958 Playback AC97-SPSA' 
 Simple mixer control 'IEC958 Playback AC97-SPSA',0 
   Capabilities: volume volume-joined 
   Playback channels: Mono 
   Capture channels: Mono 
   Limits: 0 - 3 
   Mono: 0 [0%] 
 
I don't remember monkeying with this value when it stopped working so maybe 
something changed it for me during an update, or maybe ALSA's behaviour has 
changed. Thanks for all your comments ;-)

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