I have now solved this issue by a full uninstall/reinstall of all CS models.  I uninstalled everything from P3D and I have reinstalled all the FSX models (707, 767, B-52, C-130) in to P3D, by using the FSX.exe (and FS9.exe) method.  I also temporarily put my P3D dll.xml in to the AppData/Roaming/FSX folder so the correct entries were added.  Of course I backed up all the AppData/Roaming/FSX folders and files beforehand, and then put them back when the installations were done.

All 767 sounds are good now.  The ACE also appears in the menu and starts, but I'm not sure if it's working correctly.  I also need to test the load manager for the freighter version.

It is looking and working good in P3D though, and great to fly.

Cheers,

Scott