The idea that the "last trump" is the seventh angel sounding his trumpet, that too is a concocted parallel that simply doesn't work, and here's why this Steven Andersonite doctrine doesn't work:
The popular go-to for him and his followers is this verse -
1 Corinthians 15:51-52
51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
When we read about the same event in another set of passages, things begin to shape up more clearly:
1 Thessalonians 4:16-17
16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
17 Then we which are alive [and] remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
Wait a minute...that "last trump" is now said to be the "trump of God," not the seventh angel.
Hmmmm....
Oops, and there's even more:
Revelation 11:15-19
15 And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become [the kingdoms] of our Lord, and of his Christ; and he shall reign for ever and ever.
16 And the four and twenty elders, which sat before God on their seats, fell upon their faces, and worshipped God,
17 Saying, We give thee thanks, O Lord God Almighty, which art, and wast, and art to come; because thou hast taken to thee thy great power, and hast reigned.
18 And the nations were angry, and thy wrath is come, and the time of the dead, that they should be judged, and that thou shouldest give reward unto thy servants the prophets, and to the saints, and them that fear thy name, small and great; and shouldest destroy them which destroy the earth.
19 And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings, and an earthquake, and great hail.
So, the Lord at that time, at the trump of the seventh angel, was still on His Throne with that blast from the seventh angel causing the Church, who was already in Heaven, to worship the Lord, not being raptured at the blast of the seventh angel. At a totally different time long before this seventh angel's trump blast, at the rapture, the Church is on the earth being caught up to the meet the Lord and the dead in Christ in the air, not already in Heaven, with the Church worshipping the Lord. That event is not at all mentioned in the narrative coverage of the seventh angel's blast on that seventh trumpet.
Well, this is what happens when false doctrines meet their end in the midst of what's actually stated in scripture.
MM