Hi,when I fly with FSX, PMDG 747-400/747-400F/747-400i8 often I miss some messages from ATC and then the ATC says that is the second/third times that he or her told me to change FL or bearing indications but I didn't hear any message and the Radar contact line don't show anything.That is a serious problem when in final or approaching the destination airport.Do you have some suggestions to recover this problem?Might be a too high visualization settings ? (low frame rate? now about 10-12)I have a two-dual core PC 2.7, 4MB ram and a NVIDIA 8800 GTX.Thanks a lot,Maurizio Balvetti

The first things that come to mind are an add-on competing for audio or CPU resources overload. Besides FS and RC, what other items are running. Weather? A traffic program that introduces AI on the Fly (Ultimate Traffic 2)?Operating system?Uncheck Display Text as an RC option to see if that helps. Also, disable prerecorded AI chatter to free up audio and just use AI Chatter. Be sure Interact with AI is checked.If your weather add-on has audio weather reporting turn off that feature. If you are using a weather ad-on which one.Turn off any not needed background services to conserve CPU resources.Best audio performance is obtained with a separate audio card, not an on-the-motherboard system.RC uses your Windows wav and master audio volume settings. It does not use the FS Mixer for its output.FSX does not use much if any multicore threads so your 2.7 GHz dual core processor appears like a single core CPU.Play with your FS various settings with just RC running with it, then turn on your various add-ons.I hope that gives you some ideas.

The first things that come to mind are an add-on competing for audio or CPU resources overload. Besides FS and RC, what other items are running. Weather? A traffic program that introduces AI on the Fly (Ultimate Traffic 2)?Operating system?Uncheck Display Text as an RC option to see if that helps. Also, disable prerecorded AI chatter to free up audio and just use AI Chatter. Be sure Interact with AI is checked.If your weather add-on has audio weather reporting turn off that feature. If you are using a weather ad-on which one.Turn off any not needed background services to conserve CPU resources.Best audio performance is obtained with a separate audio card, not an on-the-motherboard system.RC uses your Windows wav and master audio volume settings. It does not use the FS Mixer for its output.FSX does not use much if any multicore threads so your 2.7 GHz dual core processor appears like a single core CPU.Play with your FS various settings with just RC running with it, then turn on your various add-ons.I hope that gives you some ideas.

---------------------------------------------Thanks a lot for your kind replay.1) - The only thing that are running are FS and RC.2) - I don't use wheater report like ActiveSky at the moment to avoid CPU overload. :-)2) - Operating system is Windows XP SP33) - Audio card is Creative X-FI Platinum FATAL1TY Champion Series4) - I receive quite all messages from RC in voice and text on RC text-lineWhen the problem appear i didn't receive messages via voice and text-line, but after a while a receive the message "look at your position. I ask two times to fly at 300 degrees" (the sense is this) or "your flight level is FL 320. It is the third time that i ask to descend to FL 250" and so on...Might be that in some circumstances due to high definition settings the CPU go in overload and RC cannot send output messages ?Thanks a lot again