hey everyone, i need a bit of help. i'm looking for a recording program for free that can record voice and change the voice up, like to pitch it up to make it sound higher and make the voice sound wired like a monster or whatever.

what i am wanting to do is record my voice making a loud scream rawr for a titan yell for my titan shifter's voice when she screams.
something simaller to this. youtu.be/ADowAH-s_Kc

i need a program to make a scream like this one eren is doing in the English dubbed ep if anyone can help please let me know!