timer-applet does not produce an event sound although told so

Binary package hint: timer-applet

timer-applet 2.1.2 does not produce an event sound although told so.
detlef@MD97600:~$ uname -a; Linux MD97600 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:34:50 UTC 2010 i686 GNU/Linux'
I expect timer-applet to produce a sound when the time has elapsed.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: timer-applet 2.1.2-4
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
Date: Wed Sep 29 15:03:53 2010
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=de_DE:de
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: timer-applet