Well, if the sounds are from a sound FX CD/lib, it depends on if it's free to use or has to be licenced.
There are some CD's with a huge ammount of licence free sound fx which can be purchased.
However, if we don't know where these sounds are from and whether or not they are free, we cannot use them.
Ofc. you're free to change the sound on your client if you want to, but don't blame us when you break something.