Jazz Tangcay Artisans EditorWhen Robert Mackenzie, supervising sound editor and re-recording mixer on Jane Campion’s “The Power of the Dog,” first read the script, he felt the story not only held a mirror up to life but challenged his thinking.Mackenzie worked to capture the sounds of Montana in this story featuring Benedict Cumberbatch as Phil Burbank, an intimidating presence who looms over a sprawling Montana ranch.