Ambient Sound - How to

So I've downloaded a wav sound that I've imported to my wad trough XWE I tried to play it with script AmbientSound("ALARM1", 100); but nothing happened, how can I fix this, and how can I make it loop until canceled?

Define a name for the sound in SNDINFO, define an ambient sound in SNDINFO using the defined name, place the defined sound object in your map, use a script or lines to activate/deactivate the sound item.

http://zdoom.org/wiki/SNDINFO

eg

ALARM DSALARM

$ambient 1 ALARM SURROUND CONTINUOUS 1.0

Oh I thought it was just import / write :D ok thanks a lot, I will look at it.

Edit: Ok, so it works but it doesn't loop. How can I start the loop and how to stop it then?