Unable to get audible beep

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Install shellinaboxd as an unprivileged user to ~/bin/
2. run ~/bin/shellinaboxd -b -s /:SSH --linkify=normal --port=4200
3. connect to shellinabox and login
4. echo -ne '\007'

What is the expected output? What do you see instead?
I expect to hear the bell.wav sound. Instead, I hear nothing. If I enable 
visual bell, I do see the flash, but I do not hear the bell.

What version of the product are you using? On what operating system?
shellinabox-2.14, compiled from source
3.0.76-gentoo, #10 SMP Sat May 31 20:12:58 UTC 2014
i686 Pentium III (Coppermine) GenuineIntel
connected to shellinabox via Google Chrome Version 33.0.1750.154

Please provide any additional information below.
I have also tried with the additional flag -f 
beep.wav:/var/www/localhost/htdocs/users/username/siab/beep.wav

I have the copied the beep.wav file to that location, with 644 (rw-r--r--) 
permissions. I still seem to get no sound from the shellinabox page. System 
speakers work, I can get audio from other websites. I can also direct my 
browser to the beep.wav file in my htdocs and play that file to hear the beep.

Original issue reported on code.google.com by WABaum...@gmail.com on 3 Dec 2014 at 10:48