Garage Band

I am producing a sound track for my horror film on Garage Band, I recorded myself whispering "If you go down into the woods today, you'd better not go alone" this was inspired by the Alton Towers Thirteen ride advertisement. I did a female vocalist but changed it to a lower voice which sounds eery and frightening, I also did this with another song "1,2 im coming for you, 3,4 better lock your door, 5,6 grab your crucifix, 7,8 this is your fate, 9,10 never sleep again" but on this sound recording I used a more high pitched tone to make it sound like a child that was singing it.