ColdShine,
In your 'description.ext' declaration, I think you need to put your sound class name in the sounds array of CfgSounds,
like so...
class CfgSounds
{
sounds[] = {S01v01};
...
...
}
.. and the names of additional sound classes you add to CfgSounds.
sounds[] = {classname, classname, ...};
lmk
c_c