fgdata/Aircraft/ufo/ufo-sound.xml

<?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>
-->

  <engine>
   <name>engine</name>
   <mode>looped</mode>
   <path>Aircraft/ufo/engine.wav</path>
   <property>/velocities/airspeed-kt</property>
   <pitch>
    <property>/velocities/airspeed-kt</property>
    <factor>0.00005</factor>
    <offset>3.0</offset>
   </pitch>
  </engine>

  <wind>
   <name>wind</name>
   <mode>looped</mode>
   <path>Sounds/wind.wav</path>
   <property>/velocities/airspeed-kt</property>
   <volume>
    <property>/position/altitude-ft</property>
    <factor>-0.000015</factor>
    <offset>1.0</offset>
    <min>0.0</min>
    <max>1.0</max>
   </volume>
   <volume>
     <property>/velocities/airspeed-kt</property>
     <factor>0.0001</factor>
     <min>0.05</min>
     <max>0.15</max>
   </volume>
   <pitch>
    <property>/velocities/airspeed-kt</property>
    <factor>0.0001</factor>
    <offset>1.0</offset>
   </pitch>
  </wind>
 
</fx>
 
</PropertyList>