Beardyman wrote on Jul 17^th, 2020 at 7:18am:

Haven't noticed that, if so u can check which files are missing and copy those from back up to new sound set. U did back up right ? :-)

It's not so simple, I made the same mistake. I realize this is an old dead thread, but the information could be useful to a Tristar newbie.

You actually need to modify the original sound.cfg file to use the new TSS or HJG sound files instead of the other way around. Otherwise you lose all of the wonderful L-1011 cockpit noise and alarms. It takes some time but I figured it out pretty quickly. I copied the engine portion of the sound.cfg from TSS and pasted it into the CS sound.cfg file with some modifications and it melded perfectly. The altitude C-chord is a must have, and if you don't do it this way you lose it and everything else.