How can I edit the sound effects?

Solution 1:

You can edit the game's sound bank.
I found this video and the process is explained in the description and in the first comments.
Also you can watch the video to see the final results.

Your custom soundbank (.wav files) will have to be in this path :

C:\Program Files\Steam\steamapps\common\worms reloaded\Audio\Default\Win\CustomBanks\

Also here's the name of the sound files to create you file.

Fire Punch
First Blood
Flawless
Go Away
Grenade
Hello
Hurry
Incoming
I'll get you
Jump 1
Jump 2
Just You Wait
Kamikaze
Laugh
Leave me alone
Missed
Noooooo
Oh Dear
Oi Nutter
Oof 1
Oof 2
Oof 3
Oops
Orders
Ouch
Ow 1
Ow 2
Ow 3
Perfect
Revenge
Run Away
Stupid
Take Cover
Traitor
Uh Oh
Victory
Watch This
What the
Yes Sir
You'll Regret that