For some really obscure reason, when I fly the Sibwings Antonov and I switch to an external view, I can still hear the cockpit sound above the external engine sound! I've tried a reinstall and changed different sound settings but with no success. I have had little success logging onto the Sibwings forum, hence my post here. It's a shame because it's spoiling what would otherwise be a really great aircraft. Any help, as always, appreciated. Thanks guys...

There isn't one topic in all three (!) pages of the Sibwings AN-2 forum describing the problem you allege.

Try using the FSX sound sliders to switch off the engine sounds and see if your aircraft then flies in

total silence in spot view, as mine does.

If you mean you can hear the sound of the flaps etc  from outside, yes you can with any aircraft.

You could try staying in the cockpit.