Whose is "The voice of one who calls out" (40:3)?

Isaiah 40 doesn't name the voice. It says, "The voice of one who calls out" (40:3), then "The voice of one saying" (40:6), and then tells the one with good news, "lift up your voice with strength!" (40:9), without naming any of them. All four Gospels give the words of 40:3 where they tell of John the Baptist. Matthew says of John, "For this is he who was spoken of by Isaiah the prophet" (Matthew 3:3). Mark gives them after words the chapter on Exodus 23 looks at (Mark 1:2-3), and goes on, "John came baptizing in the wilderness" (Mark 1:4). Luke gives them "in the book of the words of Isaiah the prophet" (Luke 3:4) and goes on through the words of 40:4-5 (Luke 3:5-6). And in John's Gospel, when John is asked, "Who are you?" (John 1:19), he first says, "I am not the Christ" (John 1:20), and then answers of himself, "I am the voice of one crying in the wilderness" (John 1:23). Matthew and John's Gospel say outright that 40:3's words are of John; Mark and Luke give them where they tell of him. The New Testament doesn't say whose is the voice of 40:6, or who tells the good news in 40:9, and these notes don't either.