I've been trying out the Immerse Gamepack for FFXIV lately, and I'm just providing my feedback, but I'd like to hear your thoughts. I'm new to using the SE forum, so I hope this is the appropriate channel; yes, I'm aware of the ongoing audio stuttering/slowdown issue (I suffer from it myself), but this is regarding the Immerse Gamepack specifically.
My husband bought the Immersive Gamepack for FFXIV and gave me an account code for it, since he got two of them. I've tried it, both on an older profile and a more recent one I just made. It sounds...I admit, even after the fixes provided that you mentioned in the edit to the linked thread above, things still feel underwater or muffled to an extent, even when using the treble booster equalizer setting in-game. I suppose it's an improvement from what it was a few days ago with an older profile (I have several piercings in my ear that may have affected the AI interpretation of my ear, which I took out for my second profile), but it's not much of one. In addition, when panning the positioning around, certain constant positional sound effects (like fires or fountains) sound completely different from different angles in a way that seems unnatural and finicky; for instance, a waterfall from one angle will sound like a muffled quiet rush, while from a slightly different angle will feel like a treble-boosted kitchen faucet on blast. This is also super noticeable with house/apartment/inn-room music (since the orchestrion provides a point source for the BGM unlike other areas) where the quality and equalization (for lack of a better word) changes radically based on the audio positioning. For relatively large sound effects (think of the large waterfall in the Goblet or like Orchestrion-provided music), a more generalized sound effect that isn't so tightly spatialized (like that provided with the default audio without the Immerse Gamepack) sounds much more natural and soothing.
I can only stand to use it on full camera positioning; not only do things sound far more muffled with anything closer to the character, but it feels less intuitive as well (but then, I'm not playing a first-person game where such spatialization would be needed). As a career black mage, I have to keep the audio positioning far from my character with the new spatialization, because the transitions between sound effects happening at my character and the sound effects happening at my target are so jarring and abrupt that it just...sounds awful. Likewise, when playing something like sage or dancer with large sound effects happening all around me, it all sounds muffled and muted if I'm keeping the positioning at my character, but sounds much clearer if the positioning is at the camera. I was otherwise happy keeping the positioning at about 50 or even 70, halfway between camera and character or somewhat closer to the character, without using the Immerse Gamepack. Beyond that, though, while a number of sound effects are more distinctly spatialized, I admit that I don't actually feel or sense much of a practical difference in locating particular sound effects mentally compared to the normal stereo output. If anything, the distinct (and muffled, and abruptly-changing) sounds contribute more to a mild headache and feeling of nausea after prolonged use, which is...not great.
I've been using 32bit 48kHz audio settings on my stereo headset as suggested, and followed through with the rest of suggestions you've provided. I've turned off all other options through Windows for any other sound effects or improvements or spatializations (many of which I wasn't using anyway). I don't have an option in my headset to go any higher than that, and my headset isn't so advanced to have its own custom settings apart from what Windows itself provides. And yes, I have the most recent version of the plug-in installed.
To be honest, I'd rather not use the Immersive Gamepack at all. I'm only using it because, after a series of other attempts, I suffer from the continued audio stuttering/slowdown issues that otherwise make FFXIV unplayable. Like everyone else, I had no such issues prior to 6.0 being released (I've been playing since 2014 on several machines, and my current machine is far from being a toaster), and the issues have only gotten worse with 6.01 being dropped on us; I also have no such issues with any other game or other software on my computer. Using the Immerse Gamepack does help (reinstalling several unrelated drivers seemed to do something for me), though it still briefly stutters in limited instances still, albeit at a greatly reduced rate (in *most* cases) to the point where it's negligible, as opposed to the near-constant suttering without it (though it still does happen in some fights and cutscenes, which is frustrating). These issues can only be related to the spatialization efforts in the new sound engine and camera positioning, and while using the Immersive Gamepack is better than nothing, I'd honestly rather just go back to the normal stereo sound which I'm both used to and sounds more natural and intuitive for me for a game like this, especially with the nausea and headaches induced by it which never happened prior to 6.0 or without the Immerse Gamepack installed (though the audio stuttering is even worse to play with and forces me to mute the game entirely). In a sense, the Immerse Gamepack makes things sound like an extreme caricature of what I'd expect and what I'm used to, with the spatialization of sound effects being so over-emphasized to the point of it being distasteful.
What are other people's thoughts and experiences using the Immerse Gamepack? Has anyone continued to suffer from muffled sounds or weird abrupt changes like how I described above? Is this just something I have to get used to while using it?