This trumpet sound is the sound made when the seven seals of Revelation are broken. By breaking the seven seals, Jesus opens the scroll, so the word written in it is shown and read. The seven trumpet sounds are the voices of those who testify to the word and its fulfilled realities.
One type of food is the food of eternal life given by God, which is the blood of Jesus, who is the true vine. The other is the food given by the devil, the wild vine, which is the wine of adultery. The tree of life is Jesus, the tree of the knowledge of good and evil is Babylon's pastor.