G/day Kapitan,  This is probablt a bit late but i know what the thrust wav is, its that jet thrust noise that comes up as you increase the throttles, i have the 707 dvd and the sound is there but a lot lower pitch and not as loud, it was annoting me so i deleted it, i had done it in the previous version. Just wondering if you have a lap top the reason i ask is that i do and the other day i cupped my hand around the speakers (which are facing the ceiling) and noticed the sound is much more realistic. My main problem with the sound is not hearing the distintive turbine buzz when the engines are at high revolutions and when i cup my hands around the speakers , i can hear it What i cant understand is that i have the another company 747 / audio env extreme airliner edition that has 737, 747 engine sound that i can hear the turbine buzz without cupping mu hand around the speakers. I have the same problem with all the cs aircraft. Cap Sim have by far the best  aircraft out there, ive just got get some ear phones or find a sound pack for the 707 757 and 727. Do you know of anywhere ? take care    cya  Jeff