+1 Catseye
Any film maker will agree that good audio is actually more important than good video. When the picture suddenly goes out on your TV you usually hold off a bit from changing the channel if you can still hear what's going on. However, when the sound goes off -- even with the picture going -- the channel usually gets flipped immediately. In a flight sim, both video and audio are important. Audio is not LESS important.
I'm probably the only one here who has two buttons programmed on my throttle - one for external, one for flyby. For me the only sound that beats my stroked Harley is a Merlin engine in full cry. Jafa nailed the external sound; the flyby is darn close. Online I'm in the cockpit 100% (usually no choice, anyway!

), offline I go external and flyby a LOT, maybe even TONS!!!