I've tried to use SampleDataEvent several times over the years, but never got it to work with anything other than flash. I just tried with the newest version 5.1.3, but still no sound in Windows or html5, only in flash.
I'm not able to try neko, I always get:
Exception : Neko_error(The bootable executable file was not found : neko.exe)
and neko's folder is in the PATH.