Hi Flavio.

Have you tried starting the 727 Cold-n-Dark (KSEA) directly from the Documents\Flight Simulator X files (or the equivalent in your language version)? I find that the sounds work correctly as soon as the flight starts in FSX when I do that.

If msvcr71.dll is not included in the latest Visual Studio C++ Redistributable Package, then maybe you do need to download the older version.

Mark