I've had sound issues like these since a couple patches ago and i can confirm it happens. I mostly get it on twins (eg, Blenheim, Ju8
, there is no sound until i increase RPMs a little bit more.
About the throttle though, i don't see anything bugged. I just flew the stock cross country mission to test it.
The throttle moves correctly all across the range.
The
mixture and
prop pitch are the ones that have only two positions but that is historically correct. The Blenheim had two-position props (like the Spit 1 and the DH Hurricane we have in the sim), so it only has fine and coarse settings. It also had only two effective mixture settings, auto-rich and auto-lean, even though the lever moved all across the range the lower 50% was auto-rich and the upper 50% of the lever's travel was auto-lean.
To sum up, it was wrong before the patch, it is corrected now. Cheers
Inaccurate and faulty instrument readings like these were there in previous versions too. It's not a bug, it simulates icing of the pitot tube.
Turn on your pitot heater and you'll see it indicating correctly again