diff --git a/Aircraft/c172p/c172-sound.xml b/Aircraft/c172p/c172-sound.xml
index 0c1644985..c0d365e4b 100644
--- a/Aircraft/c172p/c172-sound.xml
+++ b/Aircraft/c172p/c172-sound.xml
@@ -119,7 +119,7 @@
     <z>-1.5</z>
    </position>
    <volume>
-    <property>velocities/airspeed-kt</property>
+    <property>velocities/groundspeed-kt</property>
     <type>log</type>
     <factor>0.25</factor>
    </volume>
@@ -177,7 +177,7 @@
     <max>1.0</max>
    </volume>
    <pitch>
-    <property>velocities/airspeed-kt</property>
+    <property>velocities/groundspeed-kt</property>
     <factor>0.0025</factor>
     <offset>1.2</offset>
    </pitch>
diff --git a/Translations/strings-default.xml b/Translations/strings-default.xml
index 3988548c5..de7b6bc1f 100644
--- a/Translations/strings-default.xml
+++ b/Translations/strings-default.xml
@@ -96,8 +96,10 @@
  <enable-real-weather-fetch-desc>Enable METAR based real weather fetching (this requires an open internet connection)</enable-real-weather-fetch-desc>
  <metar-desc>Pass a METAR to set up static weather</metar-desc>
  <random-objects-desc>(buildings, etc.)</random-objects-desc>
- <disable-ai-models-desc>Disable the artificial traffic subsystem.</disable-ai-models-desc>
- <enable-ai-models-desc>Enable the artificial traffic.</enable-ai-models-desc>
+ <disable-ai-models-desc>Deprecated option (disable internal AI subsystem)</disable-ai-models-desc>
+ <enable-ai-models-desc>Enable AI subsystem (required for multi-player, AI traffic and many other animations)</enable-ai-models-desc>
+ <disable-ai-traffic-desc>Disable artificial traffic.</disable-ai-traffic-desc>
+ <enable-ai-traffic-desc>Enable artificial traffic.</enable-ai-traffic-desc>
  <ai-scenario>Add and enable a new scenario. Multiple options are allowed.</ai-scenario>
  <disable-freeze-desc>Start in a running state</disable-freeze-desc>
  <enable-freeze-desc>Start in a frozen state</enable-freeze-desc>
diff --git a/options.xml b/options.xml
index 25e3d8b78..6e1183e1c 100644
--- a/options.xml
+++ b/options.xml
@@ -222,6 +222,16 @@
     <description>strings/enable-ai-models-desc</description>
    </option>
 
+   <option>
+    <name>disable-ai-traffic</name>
+    <description>strings/disable-ai-traffic-desc</description>
+   </option>
+
+   <option>
+    <name>enable-ai-traffic</name>
+    <description>strings/enable-ai-traffic-desc</description>
+   </option>
+
    <option>
     <name>ai-scenario</name>
     <arg>scenario</arg>