@nens
Thank you again for instructions you were very helpful, it worked like a charm
It played the exact .wav file I set up, all OK!

I'm curious now, this method works with pongo skin, is it possible to configure without it? Just regular NextGen navigation no skin.
If I do all thise steps just without skin, can it work? (I'll sure try that when I catch the time) But I guess, I'll need something else to make it work without skin.

@jorgeultra
And thank you for that list.