stuttering sound with pulse audio

When I play online chess using 'jin' (http://www.jinchess.com/), it sends short sound on every move of my opponent. Now if I have pulse-audio installed, those sounds do not come up immediately, but with *huge* latecency. Rather often it 'collects' those sounds into a single event. Usually:

opponents move: *tak*
my move
opponents move: *tak*
my move
opponents move: *tak*

With pulse audio installed:

opponents move: *silicence*
my move
opponents move: *silence*
my move
opponents move: *tak* *tak* *tak*

I already tried to move these two files out of the place (.../ext/pulse-java.jar and .../amd64/libpulse-java.so), but still the same behaviour. The settings in /etc/java-6-openjdk/sound.properties also seem to get ignored.
According to pulse audio utils such as pavucontrol java is connected to pulse.

Other than those information I have no idea how to debug this issue so far.

Thanks,
Bernd

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: openjdk-6-jre 6b20-1.9.1-1ubuntu3
ProcVersionSignature: Ubuntu 2.6.36-1.7~lucid1-generic 2.6.36
Uname: Linux 2.6.36-1-generic x86_64
Architecture: amd64
Date: Tue Nov 2 18:20:22 2010
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: openjdk-6