Thank you very much. I'll test it and will give feedback. May take some time though.
Background on my app:
I am currently writing an app which translates text to the NATO phonetic alphabet and also Morse code.
The translated text is spoken by using the speech modul in several languages (works really well) and the Morse code of the translation shall be flashing on pushing a button.
I'll also have predefined radio text and so on.