On Audacity, I recorded myself, then edited the sound to suit a more eerie-sounding track, similar to earlier David Lynch’s films.
The effects I utilized to alter the sound is:
Change Pitch to give a more chipmunk voice
Change Speed to decrease and silence the annoyance of the chipmunk voice
Used Repeat and Reversal just to create a more experimental sound
Finally I used the Wahwah effect, just because I like that effect.