Answering to myself: Installing sox.tce gives the play command, A part of the freedesktop theme sounds i found on sourceforgenet. Now, play sound.ogg obviously created a problem to alsa: Although the sound is played, i get this error msg (or warning):
$ play desktop-login.ogg
play WARN alsa: can't encode 0-bit Unknown or not applicable
desktop-login.ogg:
 File Size: 227k      Bit Rate: 452k
  Encoding: Vorbis        
  Channels: 2 @ 16-bit   
Samplerate: 44100Hz      
Replaygain: off         
  Duration: 00:00:04.02  
In:100%  00:00:04.02 [00:00:00.00] Out:193k  [      |      ]        Clip:0    
Done.
Any ideas in regard?