I made a video comparison between sound in CS707-300 FSX at 30,000 feet and a real 707 at the same altitiude and speed. Note the real sound is much sharper with strong wind noise. Throttles are middle way.

http://www.vimeo.com/19105463

As you can see, the difference is not minor...ITS BIG.
What is needed now is advice by CS support or other users on how to tweak the sound.cfg so the sound will resemble more like real. I dont think is just a matter of increasing wind from the Sound settings.
Taxi, idle, takeoff, approach will follow.
Thanks.

PS: Just discovered there is 707wind.wav file in the sound dir but its not used by captainsim (not mentioned in the sound.cfg), instead it uses the 4 standard wind sound that comes default with FSX in the main Fsx/Sound. Apparently they intended to put a more realistic sound, but gave up and released the addon with standard wind sound :(