When Jejerrod is being force choked his voice lines are out of synch with the video.
Perhaps a better voice clip for Vader
https://youtu.be/PrrI9o6CU30?t=54
to get the metallic phasing effect put the audio in twice first one where you cue it and around 8ms after for the repeated second sample.
Is’nt the start of this scene here? and the end of the scene too?