A Sonic Screwdriver extension containing the old default sonics that were originally shipped with the addon.
This addon requires the following:
Without these the addon will not function correctly and you may experience errors.
https://steamcommunity.com/sharedfiles/filedetails/?id=3129981788
Remove any previous versions then put this folder into Steam/Steamapps/common/garrysmod/garrysmod/addons/