Amixer strangeness

I have two pi's Both Raspbian. If I run amixer on each I get a
different result.
pi@raspberrypi ~ $ amixer
Simple mixer control 'PCM',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback -10239 - 400
Mono: Playback 400 [100%] [4.00dB] [on]
pi@raspberrypi ~ $ uname -a
Linux raspberrypi 3.10.25+ #622 PREEMPT Fri Jan 3 18:41:00 GMT 2014
armv6l GNU/Linux
As against
pi@raspbpi-radio:~$ amixer
Simple mixer control 'Master',0
Capabilities: pvolume pswitch pswitch-joined penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 65536
Mono:
Front Left: Playback 32783 [50%] [on]
Front Right: Playback 32783 [50%] [on]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch cswitch-joined penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 65536
Front Left: Capture 65536 [100%] [on]
Front Right: Capture 65536 [100%] [on]
pi@raspbpi-radio:~$ uname -a
Linux raspbpi-radio 3.6.11+ #538 PREEMPT Fri Aug 30 20:42:08 BST 2013
armv6l GNU/Linux
I suppose I must have run/installed something that changed it?
mplayer?
TIA
--
Regards 
Dave Saville
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Dave Saville
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