<?xml version="1.0"?> <PropertyList> <fx> <engine> <name>rumble</name> <mode>looped</mode> <path>Sounds/rumble.wav</path> <property>/velocities/airspeed-kt</property> <volume> <property>/velocities/airspeed-kt</property> <factor>0.0001</factor> <min>0.0</min> <max>0.0</max> </volume> <pitch> <property>/velocities/airspeed-kt</property> <factor>0.0001</factor> <offset>1.5</offset> </pitch> </engine> </fx> </PropertyList>