I don't know what mod that 'killingspree' sound is from, but usually you have to call the sound via script somehow, otherwise it is not playing.
If you have a mod, you need to merge the *.gsc files, such that it is a single mod, otherwise the mod gets overwritten in alphabetical order.
When you already took care of this and there is still no sound, I remember I had similar issues with the soundaliases back in the day and tried until everything worked.
Your sound files and the soundalias need to be in a .iwd file that gets downloaded by the client (iirc).