@Solisek
Hello Solisek.
I'm "Chris chris", the audio announcements manager for the SimRail Passenger application.
I'm writing to you in English to avoid mistranslations into Polish.
Thank you for your message. As far as the audio files are concerned, you can choose the format you want because I can convert the audio files (you can use the *.mp3 format if you wish).
You can send all the files to my e-mail address: chrischris@simrailpassenger.fr .
As far as what you want to send us is concerned, are they announcements that you record in your own voice or announcements recorded directly on the train?
As far as train numbers are concerned, you shouldn't specify the train number in the announcement because the audio announcements are generic for an entire line (e.g. 14xxx and 41xxx).
Thank you for the text you sent, which may help us to formulate the audio announcements correctly.
Thank you in any case for your help and I look forward to your recordings.
Have a good day.