A lot of attention has been paid to the helicopter sounds. Your turboshaft engines bog down with varying power demands. Sink quickly and you hear the rotors spin-up, acquiring energy, marvelous for timing autorotations and great cues for what is generally going on with the aircraft. There are over 100 items of speech in the game which inform you about procedures and hints at what to do next. Nope, none of that Captain Corny rubbish.
Music is provided by redbook audio CD tracks, understated, appropriate, and quite pleasant.
All sounds have slider controls to adjust volume. On approach to the local city. Testing winch operation. Hospital rooftop delivery. This is a nice easy mission in calm sunny weather.