I have found the cause and offer an interim solution:

The cause seems to be in the default volume levels assigned by
'alsamixer'. The master volume is set quite high (80%), causing the very
loud system sounds. The 'PCM' and 'Front' levels were also set to 80%
(it seems that this is 80% of the 80% master volume), making any PCM
sounds relatively quiet. This affects anything played with 'aplay' (such
as the GDM sounds), but not those played by the nautilus previewer or
totem, for example.

The solution is to increase the 'PCM' and 'Front' volume levels in
'alsamixer' to 100%, and reduce the master volume level to a lower value
(I suggest 50%, but whichever you are happy with yourself). These can be
done from the command line thus:

$ amixer set PCM 100%
$ amixer set Front 100%
$ amixer set Master 50%

Of course you can also do it manually using 'alsamixer' or 'gnome-
volume-control'.

P.S. In response to Daniel's question above, I have now tried it in 8.10
and it is reproducible there too.

** Changed in: pulseaudio (Ubuntu)
       Status: Incomplete => New

-- 
[Hardy] Sound very loud after login
https://bugs.launchpad.net/bugs/206315
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