Why Italians? Besides, your request is in the wrong topic/section.
Edit:
moved ...

You can use any sys file that comes with any world package.
Also, if you install an apk without a sys file in the base folder, it will create a generic one by itself...
And finally, you can modify the existing one yourself or create a new sys file, which will contain only the section related to dpi parameters.

Otherwise, if TTS does not work for you because of the sys file, it means that they made a mistake in the basic setup.
Because, TTS has nothing to do with the parameters in it, it only depends on engine and lang/voice files.
Wrong path(s), wrong folder(s) naming, wrong location, etc. If I remember correctly, you have made such mistakes before.