Activity Sounds

A .wav file can be attached to any activity event, and will be played when the event is triggered.
This can be used with a minimum of effort e.g. for:
- radio messages to train driver;
- on board train announcements in passenger view;
- off-board station announcements;
- etc.
The fact that simply a .wav file (which will be played once) has to be entered allows activity builders to use this feature without needing to know the .sms language neither to place fake cars on the route to play these files.