Believe it or not, that’s exactly what I thought (years ago) when I first picked up the game. The voice appears again later on, however, when the Dark Dragon and its rider near the Tower and start making it “do stuff”. The voice responds to them, and in the context there can be no real doubt that it’s emanating from the Tower.
The use of the word “confirmed” in the similar statements “Unit 01… confirmed” and “Activation of D-Type 01… confirmed” always seemed like an intentional way of revealing the true identity of the speaker (i.e. Sestren), otherwise Sestren would’ve said something completely different.
All I’m saying is that Sestren was working through the Tower, and that by sending instructions to the Tower, Unit 01 merely activated it. Once the Tower went online Sestren took charge of the situation.
ok, i half-remember that (time to revisit kyle’s adventure :D)
so then what was the empire’s role in PD1? the tower was off their coast, they were trying to stop you (capture you?)… they must have known something was up to have that fleet deployed over the city. any ideas?
But as I said, if you compare the two passages which are actually referring to the same thing (i.e. the activation of the Dark Dragon) they do say completely different things. And as I’ve also pointed out, the ruins and Sestren talk in a very similar (logical, formalised) way anyway, so any similarities aren’t particularly hard to explain. In fact, lots of ruins talk in the very laborious “x is happening… confirmed” manner. For example, at the Forbidden Zone the ruins say:
Intruder Alert. Shift to Warning Level 1 …Confirmed.
… and at Uru the ruins say:
…Protect Key #1 confirmed… Protection Level… lowered to Level 2…
…Protect Key #2 confirmed… Protection Level… lowered to Level 2…
…Protect Key #3 confirmed… …Deactivation of final level …completed…
Those lines are definitely not the voice of Sestren, but they follow the same logical mode of speech - because all of these things (Sestren included) evidently had the same makers. And like the voice that comes from the PD1 Tower, their voices are not literally the same as Sestren’s and they do not say the same thing; their sentences are simply structured in a similar way.
But as you say, it was the Tower that the Drone would have been giving instructions to, not Sestren; and it’s the owner of the voice that is receiving the instructions, so logically the voice has to belong to the Tower.
And as I said before, why would Sestren choose to randomly transmit its voice out from this particular Tower on this particular occasion? We never see this happen anywhere else in the games, and it wouldn’t make any sense. However, we know that the automated voices of all ruins do get transmitted out in this manner, so that’s surely the more logical explanation.
The Empire’s Tower Report book from Panzer Dragoon Saga should give you a pretty good idea of where the Empire was at in PD1. Basically they were trying to activate the Tower for themselves - believing it to be some kind of ultimate weapon - but what actually ended up activating it was the Dark Dragon and its rider, and the results weren’t what the Empire was planning for. The Empire played the role of unfortunate bystanders for the most part; when they weren’t trying to viciously capture the dragon for their own purposes, that is 
it all makes sense now… somehow i completely missed that in saga. i’ll make sure to find that next time.
Nothing changes the fact Sestren was controlling the Tower, so this becomes a circular argument. When the voice of the Tower orders an army of pure type creatures to invade the capital are we really meant to believe Sestren itself isn’t the one responsible for coordinating the invasion?
Why would Sestren’s voice confirming the activation of the Dark Dragon be recorded in a memory orb about the events of Panzer Dragoon if it wasn’t its voice emanating from the Tower?
Well the Drone did give the “instructions” to the Tower which resulted in the immediate release of the monsters, so I was going on the logical asumption that the Drone ordered the attack itself. Whether Sestren was then personally coordinating the monsters or not is ultimately a different matter, but the Tower did release the monsters on the Drone’s command. It therefore has to be the Tower’s voice that’s confirming it’s received the instructions, because as I keep saying, Sestren would not be carrying out a Drone’s bidding. The physical Tower would be.
Sestren may have been the overseer of the Towers, but - at least after the Towers fell into inactivity or were forced into inactivity - it clearly wasn’t capable of operating every aspect of them itself. Azel’s intervention activated the Tower of Uru just as the Dark Dragon’s rider commanded this Tower to release its monsters.
So I believe my point stands: it was the physical Tower itself that was carrying out the Drone’s instructions at that point, not Sestren. Sestren did not wait there for the Drone to tell it to release the monsters; if Sestren could have done that itself (and wanted to do that itself), it would clearly have done so already. Logic dictates that the voice we hear is the pre-recorded voice of the Tower.
Because (directly or indirectly) Sestren did indeed activate the Dark Dragon, which we wouldn’t have been aware of prior to seeing that memory orb - that’s the small revelation that the orb is getting across, and ultimately the point of it. The fact that the Tower acknowledges this same activation in PD1 (with different words and a different voice) actually makes perfect sense, because the Tower was clearly linked to and attuned to the Dark Dragon and its Drone rider.
The Dark Dragon was the Tower’s estranged Guardian, after all, and the Drone was presumably designed to interface with it. I’d image that the Tower’s systems would focus on their activation and subsequent journey “intently”, if such a word could be applied to a Tower’s automated tracking equipment.
A simple matter is beeing stretched into infinity here…
In PD its normal that ruins have voices.We never heard Sestren’s voice outside of the Sestren Space.So it’s easy to conclude the rest…
i never thought of sestren as anything physical, more like a mind and a place outside of this world that has some dominion over the ancient creations.
their programming equips them to be able to handle encounters cocerning humans, mutant types, environmental events, as well as whatever their mission or purpose was. but they are not prepared for the heresy dragon eventuality, which is where sestren comes in. typically an observer, recorder, and “system administrator” sestren can interrupt the ancient creations’ current tasks and set them upon a more pressing one task (such as sending shelcoof to destory elpis before the heresy program could create an army of heresy dragons).
but if we analyze it more, sestren can’t control drones… and perhaps cannot infringe upon their actions at all. this would explain why azel was able to send edge into the sestren. even if sestren was in control of the tower of uru, it may have been programmed to not restrict access to itself.
if in the ancient times sestren were to go insane or fail to follow directions for any reason, there would be no way of stopping it if it were able to close off it’s entrance. it’d be like fighting a ghost; it can hit you but you can’t hit it. so maybe it was a safety measure to allow drones to not be controlled by the sestren and not allow sestren to thwart their decisions.
wait, what was my point? uh… it had something to do with the world being a chess board and ancient creations are the pawns of sestren and lagi is the pawn of the heresy program. neither is “in” their pawns, and actually only interracts with them when there is something they must do that they would not normally do themselves.