as i own the the regular version, i`m not sure about the free version but i dont see any limits here:
So, i guess it will be working.
Ok- lets go:
double-click into your layout and choose media--> audio.
then import a soundfile by rightclicking the folder Sounds or music.
I use .ogg-format(which is recommended if i remember correctly). You can download free sounds from the web
more free sounds
and use i.e audacity to create or convert ogg-files.
And then connect the audio-file with an action in an eventsheet. i.e system--> on start of layout--> audio--> play.
ItS quite easy.