Working on ltsp-client 5.4.2-6 from debian wheezy.
It uses pulseaudio 2.0-6.1.

Some audio applications work:
paplay
mplayer
dragon
These will  lock up the pulseaudio server:
vlc
kde system sounds.

This is the startup in ltsp-init-common

............................
               PULSE_DETECT=module-udev-detect
                PULSE_VOLUME_RESTORE=module-stream-restore
                /usr/bin/pulseaudio --system \
                --exit-idle-time=-1 \
                --disable-shm \
                --no-cpu-limit \
                --resample-method=trivial \
                --high-priority \
                --log-target=syslog \
                -L $PULSE_DETECT \
                -L "module-native-protocol-tcp auth-anonymous=1" \
                -L $PULSE_VOLUME_RESTORE \
                -L module-rescue-streams \
                -L "module-native-protocol-unix auth-anonymous=1" \
                -n &
.....................................

I did a bunch of experiments removing various modules in the startup on the 
client.  I have been unable to improve the situation.

What does work is to run in user mode.
The easiest way to start user modeis  is:
Kill pulseaudio or disable it from starting.
On terninal run  
ltsp-localapps pactl list

Everything works fine in user mode.
Sounds like this may be a better way as system mode is discouraged.
Need to work out the fine points.
Should be able to do start up in /etc/X11/Xsession.d/
May be some permission issues.
I have tried on several different installations and need to get this off the to 
do list.
Anyone else having problems?

John

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