You have to get the pinbrowser software on your pc.
You take the original code file for your pin from the stern website.
You load it into pinbrowser and then you can change the small soundfiles with other music or sounds.
To be able to change the longer soundfiles you need to activate a payed version of the browser
You put the sounds in the romfile snd then on to an usb.
This usb you put in your stern in the backbox and load it onto the pin.