<If you really want the Deep to have a true and proper defined voice, and not just a mix like the Traveler and the Nine have given us, then I think it should be based on... a vessel. Oryx spoke to the Deep once in the Ascendant Plane, and spoke to it outside of that realm via an Ogre. I'm going to assume that it will use a similar tactic here, speaking through a chosen from the Pyramid Armada. Really thinking about that brings back theories and other thoughts that pass through my mind from time to time. Assuming the creatures Cayde saw in a vision and the Drifter found on that ice planet are simply creatures created by the Darkness, similar to the Nightmares, then that statue is really our only representation of what's in those ships. Take the [url=https://www.artstation.com/artwork/4LEJ8]concept art[/url] that statue was ripped from, notice how there's a set of statues ABOVE the veiled ones*? Perhaps that, and possibly the veiled statues as well, represents the chosen one, who rejects their own will and allows the Deep to inhabit their body. That's our "sacrificial Ogre" so to speak, different shape but same function. If this is how the Darkness wants to interact with this universe, then its voice will probably be based off the body it inhabits, but with a clear distinction that makes it sound... unnatural. Something along the lines of the Seventh Sister of the Sith Inquisitors, who has a somewhat robotic undertone. That or the voice could be like someone under Goa'uld possession, who gain a deeper, booming voice. Perhaps that was a point of the final Shadowkeep cutscene, showing us that IT has no real shape on its own, but can and will inhabit others. I cannot answer your question... but perhaps I have helped some visualize an enemy that is formless and how it will interact with us if it ever does. *also in that concept art, above the veiled statue but below the royal one, there are green banners with a symbol on it. Those are symbols from OUR history, labyrinth designs made centuries ago that also appear in Destiny 2 RIGHT NOW on Io if you look in the Cradle.>