EXTERIOR:
At cruise, the sound is far too quiet, there is not much of a roar from the engines, or wind. There should be some sort of environmental wind sound that should more or less drown out the engines anyway.
The whine from the engines isn't quite right. The 4 CFM56's are quite screachy as they accelerate past 40% and up to takeoff power. You can quite regularly hear them slightly out of sync making some cool harmonies!
Buzzsaw sound is too distant, it sounds as if the aicraft is 2KM away, should be more buzzy and intense.
INTERIOR:
The CFM56-5's on the A320/340 accelerate very slowly up until 30-40% N1, after that they accelerate very rapidly and are responsive especially when launching straight to their takeoff setting. They also have a quirk where they drop pitch ever so slightly when you advance the throttles to stabilize the engines at around 50% N1, as if they overshoot ever so slightly and bring themselves back to their assigned power! Would be nice to have the sounds adjusted to match this.
The whine sound in general just doesn't sound like a CFM56, it needs to be more intense and audible.
Buzzsaw intensity is off internally also, it should have much more of a growl to it.
The range of pitch is too low and limited, as if the engines are dramatically derated. On the iniBuilds A340, the buzzsaw isn't really audible until about 90% N1. An A343 at TOGA will have mostly exceeded the buzzsaw range, which starts in the high 70's/low 80's N1. For example:
The distinct sound that you get when you advance the throttles is missing entirely, inside and out. It's like a deep roaring sound that's independant of the engine RPM and doesn't change pitch. It's caused by compressor bleed valves being opened as the engine accelerates.
The transition from cockpit to cabin is abrupt. The cabin is far too quiet, engine sound and environment sound.
No 3D internal engine sounds. The sound sitting behing the wing should be very different to sitting ahead of the wing, as is sitting over the wing.
Ground roll sound is missing. Such a shame after how great it is on the A350!
I'm sorry if I seem pedantic... I just really like airplane noises 🙃