Tried downloading the Shorts Tucano (fsxtuc.zip) twice. Plane flies well, but no sound. The "sound" folder only contains a 1kb file sound.cfg.
Sound.cfg is aliased (uses the sound from another aircraft)
[fltsim]
alias=other aircraft name\sound
If you installed the 'Simshed Tucano' folder to..\Simobjects\Airplanes\.. open the sound.cfg file, in Notepad, and edit to;
[fltsim]
alias=other aircraft name.\sound
Or, take the sound from another aircraft and put it into the Tucano folder.
Get rid of the small one in there.
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