Update:
The sound was not playing correctly, and they've issued a patch, which apparently will go out with each new purchase.
It's an improvement, however, I'm still unhappy with the sound.
It has its own sound files, which individually sound OK.
With the engine running, either on the ground, or flying, I would expect wind and a louder engine & prop sound when the cockpit canopy is slid back. There's no change.

Watching from the control tower, I expect increasing engine noise, and usually, the Doppler effect as the aircraft passes. The sound is constant.
In spot plane view, sounds should vary with distance from the aircraft. They are constant.
I expected a noticeable change in sound as the airspeed increased on take off. I wasn't convinced by what I heard.
I haven't RTFM yet of course, but this is one of the very few aircraft that will go from straight & level into a loop without hesitation.
My first impression is that a heap of effort went into the visuals; for instance, hitting my autostart button takes me through a highlighted step by step highlighted procedure, culminating in the actual start up.
The operator can go through the ritual of removing pitot cover, opening engine cover panels, and shifting wheel chocks.
The emphasis on the above seems to have diverted attention from other matters. Am I being too picky for AU$25?
