The seventh or last trump is not completely unknown even now. Some people hear it at low volume and at that volume, they are not changed completely. It is heard as a profound silence. I don't know how else to describe it except as a "deafening silence." The person can still hear the earthly sounds around him, but they sound far off and almost unreal. He will also experience a profound peace. I think many people have experienced it without knowing what it was.
To the sinner, this trump is threatening. It makes a very loud noise -- it's like a musical note that threatens to shatter an object. When this trump sounded at Sinai, the people didn't want to hear it. They asked Moses to go off to talk with God. The people could discern ten sayings in the Voice of God; but Moses understood it all.
I think it is always there, but usually at low volume. At Sinai, it kept getting louder.
Exodus 19:19 And when the voice of the trumpet sounded long, and waxed louder and louder, Moses spake, and God answered him by a voice.
Revelation 10:7 But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.
David wrote of why Israel did not enter into the eternal rest:
Psalm 95:7 . . . To day if ye will hear his voice,
8 Harden not your heart, as in the provocation, and as in the day of temptation in the wilderness:
. . .
10 Forty years long was I grieved with this generation, and said, It is a people that do err in their heart, and they have not known my ways:
11 Unto whom I sware in my wrath that they should not enter into my rest.
Today is always the day of salvation. The same period of 40 years shows up after Jesus' message. The end of the age was near. Some would hear the Voice from Heaven and soften their hearts and others would not.
Revelation 14:6 And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,
I believe all seven trumps are around all the time, but at low volume. The world is sustained thus. It would collapse otherwise. As they get louder, things that are not in line with Heaven begin to crumble.
If someone has not experienced awareness from outside his body, he may find it difficult to fathom how it would be. One needs to experience what is flesh and what is spirit by having the two separated, at least temporarily.
Hebrews 4:12 For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
It is called the Word of God there, elsewhere others get more specific and refer to it as the last trump or the seventh trump. All seven trumps must be allowed to do their work. Thus "Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God."
My explanations also explain why John said those born of God do not sin. Those born of the Spirit do not. Those who are born of water can; but after their souls are made immortal, they are changed and do not sin.