I just tested it, and can confirm this works.
You can do this:
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The easy way (recommended): simply by using the built-in import/export options in FxSound’s menu; or
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The hard way: by copying all the presets you can temporarily miss directly from
C: \ Users \ [YourUsername] \ AppData \ Roaming \ FxSound \ Presets
to another folder of your choice, newly created or already-existing; and then deleting them one by one through the menu in the interface. (Yes, you could also just delete the presets directly inside the Roaming folder too, of course, but you’ll get one or more annoying error messages after doing so. EDIT: I just tried this - avoid it, it will destroy your presets!) It’s worth mentioning that you’ll need to go to Tools > Folder Options > View in the menu bar on top, and enable Show hidden files, folders, and drives first, in order to be able to access the hidden AppData folder, and perform the operation this way.