<?xml version="1.0"?> <PropertyList> <fx> <engine> <name>burner</name> <mode>once</mode> <path>AI/Sounds/balloon-sound1.wav</path> <condition> <property>engines/engine[0]/running</property> </condition> <volume>1.0</volume> <reference-dist>100.0</reference-dist> <max-dist>3000.0</max-dist> </engine> </fx> </PropertyList>