The great multitude appear in heaven when the seventh seal is opened. This corresponds to the rapture and the first resurrection.
The rapture and the first resurrection are also said to take place at the Last Trumpet.
This can easily be reconciled if the Seventh Seal and the Seventh trumpet are coincident.
The Seventh Trumpet also brings with it the Seven Bowls of God’s wrath or what is known as the third woe.
The Wrath of the Lamb follows the opening of the 6th seal. This could refer to the Seven of Trumpets but could also refer to just the last trumpet with the seven bowls of God’s wrath.
If it is referring to just the Last trumpet, then the first six trumpets would precede the seventh seal and could possibly align with the first six seals.
If the seals and the trumpets are synchronized, S1-T1, S2-T2, S3-T3, S4-T4, S5-T5, S6-T6, S7-T7, this would mean that an angel blows a trumpet every time Christ opens a seal. It would also mean that when Christ opens the last seal, the Children of God are revealed and the rapture and the first resurrection take place (ie Christ returns to redeem the Church). It also means that for those of us who are watching, we can have a rough idea about where Jesus is up to.