from preamble:

"Change Set:		SoundSystems
Date:			11 August 2003
Author:			Adam Spitz

There are lots of places in the image that play sounds but shouldn't
really depend on the sound system; if sound support isn't present, they
should still be able to do their jobs (just a little more quietly :).
This changeset adds a class called SoundSystem, so that we can say
things like:

SoundSystem default playSoundNamed: 'croak'."
!
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