Kevin,I approached you as another "techie" hoping for strictly technical discussion. Instead for unknown reason you totally misread my post and concluded I was making fun of you. I don't know what happened perhaps I used a wrong word somehwere (if so I apologize) or the stars are not cooperating. Subsequently you dismissed me as another dilletant. I also sense certain lack of humor which might have compounded the problem. But since you asked - my simulation experience dates back to 1980 when working at Singer-Link on radar simulation for B-52 - all this strictly in assembly language on Perkin Elmer Interdata minicomputers. My current work is with Air Traffic Management unit at NASA Ames simulating and investigating various future approaches to ATC. But I do thank you for your last post and I feel I definietly got everything I could possibly get out of this thread, it is time to move on. Best.Michael J.WinXP-Home SP2,AMD64 3500+,Abit AV8,Radeon X800Pro,36GB Raptor,1GB PC3200,Audigy 2

Thanks for the info. I do have a sense of humour, but it tends to fail under directed criticism. If you posted something about ATC or radar and I picked at it without fully understanding I don't suppose you would see the funny side either.But I agree, the topic is overdone. Let's hope PMDG get their pressurisation system finished soon.Best regardsKevin