Javascript doesn't play() embedded sound

Question

This is a question about the PDF specification regarding how to use the javascript API
to play a sound object.
Specifically, why in my basic example is the javascript able to see the sound,
but can't play() it?
I have a test PDF illustrating my problem at
http://www.affexion.net/test/PDF/test-scriptsound.pdf
This is a stripped down example.
The sound is referenced from a simple annotation
on the left. Double-clicking it plays the sound as expected.
On the right is a button which when activated is supposed to
execute a javascript.
<< /S /JavaScript /JS ( console.show(); try {this.sounds[0].play(); } catch(e) { console.println(e.toString()); } console.println(this.sounds[0].name); ) >>
I see the console open up, and I see it print the name of the sound "mySound",
but I don't get the sound played.
Do I need to do something in my javascript before I call this.sounds[0].play?
Is there some other mistake in the way I have the sound object embedded and referenced?
Thanks very much for any help.

Answer 1

In followup, I have been able to accomplish what I wanted:
use an embedded javascript to play an embedded sound
For future readers, my example is (temporarily) at:
http://www.affexion.net/test/PDF/sound-by-script.pddf
How I did it:
interaction of 2 components, the script and the (named) sound
The script object looks like:
<< /S /JavaScript
/JS ( console.show\(\); var s=this.getSound\("mySound"\); s.play\(\); )
>>
The named sound "mySound"
The catalog needs an entry pointing to a name dictionary, like:
1 0 obj << /Type /Catalog /Names XX 0 R >> endobj
The name dictionary has an entry /Sound like
XX 0 obj << /Sound XY 0 R >> endobj
Then the actual name mapping:
XY 0 obj << /Names [ (0xFEFFmySound) XZ 0 R ] >> endobj
With the sound object at:
XZ 0 obj << /Type /Sound /Length NNNNN >> stream...endstream endobj
Key point: the string object (0xFEFFmySound) needs to be unicode-16 encoded
with the first 2 bytes being FEFF.
That was a real pitfall for me.
Now that whole setup actually works.
Sadly, though - I looked all through the PDF specification and
in section 7.7.4 Name Dictionary, I don't see any Sound key.
If anyone could explain how that sequence of Name dictionary to
sound name is described in the specification, I'd appreciate it.