could be alert added to ex4 indicator?

Hi,
I have coded indicator [.ex4] and would like to add sound when it reaches or croses 1 or 99 at the ed of bar. Is it possible simply by importing it as external indicator to new one [from this web i do understeand that it can be done:
http://www.metatrader.info/node/39

[If not, there's no poit to learn codig for me

Thanks!

P.S.
I attach my ex4 file if anyoe can do it for me.

yes, you should be able to use iCustom() in a new ind and then have alerts on the values returned by it.