thank you for the response and some tips on how to modify in play sounds, as for my concern, the thruk won't play sound when there are alarms like critical or warning on the list. as per checking on /etc/thruk/cgi.cfg
# SOUND OPTIONS
# These options allow you to specify an optional audio file
# that should be played in your browser window when there are
# problems on the network. The audio files are used only in
# the status CGI. Only the sound for the most critical problem
# will be played. Order of importance (higher to lower) is as
# follows: unreachable hosts, down hosts, critical services,
# warning services, and unknown services. If there are no
# visible problems, the sound file optionally specified by
# normal_sound' variable will be played.
#
# <varname>=<sound_file>
#
# Note: All audio files use relative paths from /thruk/cgi-bin/status.cgi
# and must be accessible by web
host_unreachable_sound=../media/critical.wav
host_down_sound=../media/critical.wav
service_critical_sound=../media/critical.wav
service_warning_sound=../media/warning.wav
service_unknown_sound=../media/unknown.wav
ll /usr/share/thruk/root/thruk/media/
total 160
-rwxr-xr-x. 1 root root 34138 Dec 20 09:45 critical.wav
-rwxr-xr-x. 1 root root 18010 Dec 20 09:45 ok.wav
-rwxr-xr-x. 1 root root 10234 Dec 20 09:45 unknown.wav
-rwxr-xr-x. 1 root root 24480 Dec 20 09:45 warning.wav
it seems to be in order. i'm a bit confused why it doesn't work. do you have any suggestions?