As much as I want to defend Aerosoft here, as I generally really like the Twin Otter, the sounds are extremely subpar still. If it wasn't for the sounds I'd really enjoy this plane, but the audio is so glaringly bad that it's like a punch in the face everytime I have to adjust the throttle.
Yes, the transitions are a bit smoother than before, but the complete lack of gradual pitch change just sounds extremely unnatural. The startup and shutdown don't sound like they were improved much at all and are still full of hard cuts and 3d positioning issues.
On the original release I assumed they just ran out of time and had to throw in a first draft of the soundset to hit a deadline. Obviously not ideal, but hey, I've been on enough projects where the planning doesn't work out as intended and you just have to go with it and salvage it afterwards. But if this is the fix I'm not so sure that Aerosoft actually knows how to fix this. I have never worked with WWISE but variable pitch is surely not a super advanced or complex feature. What's really puzzling is that the manual explicitly credits Turbine Sounds Studios and, without knowing their exact involvement, this might even hurt their reputation to a degree.
Maybe this is just an intermediate fix and the final soundset is still in the works and will take some more time. But for now I will assume this is as good as it's gonna get and hope for a mod that will make the sounds bearable. Until then it pains me to say that this plane will stay mostly grounded for me.