I don't believe I specified a certain ordinal of trumpet, but if there is a seventh trumpet, then the trumpets before cannot be described as "last" if the word is to have any meaning. For communication clarity, here's relevant passages (and please tell me if I missed any):
Matthew 24:30-31 KJV
(30) And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
(31) And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
1 Corinthians 15:52 KJV
(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.
1 Thessalonians 4:15-16 KJV
(15) For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep.
(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:
The Lord descends from AND
The dead in Christ rise, AND
the Son of Man appears and gathers his elect,
... all with the sound of a trumpet, also called "the last trump" by Paul in 1 Thessalonians.
Revelation 9:13-14 KJV
(13) And the sixth angel sounded, and I heard a voice from the four horns of the golden altar which is before God,
(14) Saying to the sixth angel which had the trumpet, Loose the four angels which are bound in the great river Euphrates.
Revelation 11:15 KJV
(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.
The passages above are to establish that "the seventh angel sounded" is equivalent to the seventh trumpet of the seventh angel, and I am assuming that is the trumpet you are referencing. Now here is the strange part, when a doctrine requires such acrobatics as that "the last trump" is not the last trump at all, but the beginning of trumps. How can "the last trump" occur before the first trump? Very strange indeed...
So whether there be trumpets after the seventh trump I cannot specifically say, but if there are they aren't mentioned. What we are specifically told us that the saints are caught up (AKA "raptured") at the last trump of God, and that we on the ground do not go before those that are raised. The dead rise first, then we are changed.
So what I would like to know (please tell me) is the "Pre-Trib Rapture theory" separable from MAD-style Dispensationalism? Does one have to hold one to logically maintain the other?