<?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>0.3</min>
   </volume>
   <pitch>
    <property>/velocities/airspeed-kt</property>
    <factor>0.0001</factor>
    <offset>1.5</offset>
   </pitch>
  </engine>
 </fx>
</PropertyList>
