-First record your voice like a “malicious voice”
- Open a new multitrack session
-Drag your audio at track 1 and a copy to track 2
-In track 1, select from MODULATION menu the PHASER effect:
-Select the “Underwater” preset: Change this “Stages=2, Intensity=50.2, Mix=30.4”
-Select from the TIME AND PITCH MENU the Pitch Shifter effect: Change this “Semitones=-3”
-Enable High Precision and check the “Use appropiate default settings box”
That’s it, just export it to a new file and you are done. Maybe it’s not 100% equal but I think it will work, it all depend on your voice when you record it. This I got it from another guy.
You also can put at the end some flanger (at the final mix) But this is up to you.