Replacing Magic Sounds

[An_Omen]

I have a real problem. It should be very straight forward as is but perhaps I'm missing something.

 

I created my own sounds (WAVs) to replace the casting, hit and travel magic spell sounds for fire, frost and shock. Now I thought it would be easy and just rename the new files with the existing Oblivion file names and copy/paste the new sounds iinto the data/sounds/fx/spl folder. This was not the case however as somehow when it comes to hearing them in the game, it's just silent. Maybe it's more complicated as in the bitrate and exact length of the files must match.

 

any ideas?

 

Appreciated