Mulpatcher and sound

[patriarch1107]

Hello,
I have been trying to import new sounds into sound.mul by mulpatcher. I have my sounds in the right format (the format is exactly the same as with the original sounds i exported from data), but once I import them and play them (directly in the mulpatcher, uofidler and on my server) there is this weird claping sound after the sound ends, little like switching off the microphone. The thing is, that if i export and import the original uo sounds by mulpatcher, they are all fine. So, has anyone experience with this? Is it the mulpatchers fault or something with the files I am trying to import?
Thank you.

Edit: and does anyone know some other program to modify my sound.mul data other than mulpatcher/fidler?

[RadstaR]

Try my Manawydan Sound Editor:
http://ultima.manawydan.cz