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[The Fifth Horseman]

The sound settings are stored in synd.bat (for the original version) or synd.inf (for Syndicate Plus). You can modify either file with Notepad.
In the original, running main.exe directly will make the game use autodetection.
In Syndicate Plus, deleting synd.inf will make the game enter sound setup next time you run it.

The sound issue may be due to the version of the game that is posted on this site; it may not be packaged with sound.

The version of Syndicate on Abandonia HAS full sound. If you can't get it working, you're doing something wrong.