Hint #1: The answer is comprised of three words
Hint #2: 1-A, 33-A, 46-A, 72-A
Hint #3: The clue from 72-Across helps us parse the three sound checks: "B or R," "P or K," "F or K"
Hint #4: Apply the three sound checks to the three longest entries in the puzzle
Hint #5: Only the first words of the three longest entries are relevant
Hint #6: "Bowler Poster Typhoon" almost sounds like the answer to the meta... you'll need to change a letter sound in each of these words