^Are you able to view the attachment, or is that just a wtf at my extensive list?
Okay! Here's the reasoning I managed to come up with as I read through this thing during the more tedious parts of my most recent playthrough of FFIX:
Paragon of a mute usurper, I.
The conductor traditionaly does not say anything while conducting an orchestra, and instead lets his hands do the talking. Since the conductor assumes the lead role in an orchestra and is the center of attention, he is usurping the spotlight from the rest of the orchestra.
To Occident and Orient adjunct.
The conductor stands directly in the middle of the orchestra, which would be the adjunct to the east and west sides of the band.
Mine avocation, dearth to pacify,
By rubicund umbrage nigh-on defunct.
The conductor's job, to fill the room with music(pacifying a dearth of sound, so to speak), is basically stopped by the Bomb(the rubicant umbrage, or red offense) that Queen Brahne fires on the Prima Vista. For a long while I thought the rubicant umbrage was actually the Red Rose, since rubicant is not just any red, but specifically a rosy red. That line of thought led me to something in Lindblum, which is the only place in the game directly attacked by the Red Rose. Of course, this was incorrect and only fit this one verse, so I moved onto other "red offenses" such as the Invincible's red eye, the red chocobo, and the red light of Terra, and of course the Bomb enemy.
O, keen watchman to mine own, falter not,
To vouchsafe designs most astronomic.
Misplaced pursuit doth leave much truth forgot,
Affinity only one may mimic.[/
The watchman in this case would be the Ticketmaster in Alexandria. And the astronomic designs he's vouchsafing are the validity of the tickets that are presented to him. He recognizes Vivi's ticket as a fake right away, so he indeed falters not in his duties. I initially was convinced this verse must either refer to the Stellazzio coins or the three shops in the game named after stars(Altair, Vega, and Morning Star). More dead ends and more head scratching on my part, unfortunately.
In anterior regard, quite absent,
Yet present, attending interregnum.
Contrary to self, mine heir apparent,
Abide, thou dost, foremost, and in tandem.
The optional text that leads to the full name of the conductor is not immediately viewable when you first talk to the Ticketmaster, yet it is there, waiting for you to ask him about the play in the right order.
Confused, the vulgar see vengeful death's course,
Heaven's flute scourged, even focus slaughtered.
Yet displace determiner from this source,
A riotous assembly remembered.
This is the big anagram part of the riddle. I'm still not sure how to get this all the way to the answer. I do know if you displace the determiners in the verse(take the "yet" in the third line and switch it with the "the" in the first line) you can make out both Lav Layderce and Conductor. I do not know exactly what to do with all the other letters though. I imagine the riotous assembly is the orchestra. I'm very curious to see what exactly is going on here.
Twixt conscience caught and more relative grounds,
All tears and woe be in our presence past.
At helm of craft, portentous death knell sounds.
Recurrent pause, wilt thou begun at last?
The band plays music in the forest to lift the morale of survivors(getting rid of sadness), and the helm of craft probably refers to the conductor being at the head of the band. The recurrent pause is still iffy though. Perhaps the pause before the band starts playing?
Is't a 'What'? Tis that thou thinkest of me?
Is't a 'Who'? Thrice shalt thou deceived be...
If this has something to do with the anagrams, then I imagine you have to solve an anagram within an anagram to get to the name of the answer.
The two anagrams throughout the puzzle, "If only I had a place to call home" and "gysahl greens" I initially thought referred to Bobby Corwen, then later thought referred to something in Dali, or some character who got displaced throughout the game. The last idea I had was it had something to do with Chocobo's Paradise and Choco's search for home. Now...well I'm clueless as to what they have to do with the conductor of Tantalus's band.
Anyways, there's my best reasoning. I'm sure there's much more to it, but that's what I got out of the riddle.