Added interface to ATC xponder hardware.

[flightgear.git] / docs-mini / README.xmlsound

diff --git a/docs-mini/README.xmlsound b/docs-mini/README.xmlsound
index 4b9632340eaf2774ed08bd852bc2cf034c4d9c06..165197768c9b7d07725024e11dd715a5ea3e0a1e 100644 (file)
--- a/docs-mini/README.xmlsound
+++ b/docs-mini/README.xmlsound
@@ -155,7 +155,19 @@ Configuration description:
  
      <property>
        Defins which property supplies the value for the calculation.
+       Either a <property> or an <internal> should be defined.
        The value is treatened as a floating point number.
+
+     <internal>
+       Defins which internal variable should be used for the calculation.
+       The value is treatened as a floating point number.
+       The following internals are available at this time:
+
+       dt_play:        the number of seconds since the sound started playing.
+
+       dt_stop:        the number of seconds after the sound has stopped.
+
+       random:         a random number between 0.0 and 1.0
  
      <type>
        Defines the function that should be used upon the property