diff --git a/Sounds/A320-common-sound.xml b/Sounds/A320-common-sound.xml
index 401c0c18..8324a945 100644
--- a/Sounds/A320-common-sound.xml
+++ b/Sounds/A320-common-sound.xml
@@ -11,8 +11,8 @@
 			</condition>
 			<volume>
 				<property>/systems/apu/rpm</property>
-				<factor>0.003</factor>
-				<min>0</min>
+				<factor>0.005</factor>
+				<max>0.3</max>
 			</volume>
 			<pitch>
 				<property>/systems/apu/rpm</property>
diff --git a/Systems/cfm56-sound.xml b/Systems/cfm56-sound.xml
index 5d46eb97..510bc19f 100644
--- a/Systems/cfm56-sound.xml
+++ b/Systems/cfm56-sound.xml
@@ -268,8 +268,8 @@
                     <product><property>/engines/engine[0]/n1-actual</property><value>0.01</value></product>
                     <entry><ind>0.00</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.55</ind> <dep>0.10</dep></entry>
-                    <entry><ind>0.60</ind> <dep>0.30</dep></entry>
-                    <entry><ind>0.90</ind> <dep>1.00</dep></entry>
+                    <entry><ind>0.60</ind> <dep>0.20</dep></entry>
+                    <entry><ind>0.90</ind> <dep>0.70</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -328,8 +328,8 @@
                     <product><property>/engines/engine[1]/n1-actual</property><value>0.01</value></product>
                     <entry><ind>0.00</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.55</ind> <dep>0.10</dep></entry>
-                    <entry><ind>0.60</ind> <dep>0.30</dep></entry>
-                    <entry><ind>0.90</ind> <dep>1.00</dep></entry>
+                    <entry><ind>0.60</ind> <dep>0.20</dep></entry>
+                    <entry><ind>0.90</ind> <dep>0.70</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -390,7 +390,7 @@
                     <entry><ind>0.00</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.60</ind> <dep>0.05 </dep></entry>
                     <entry><ind>0.70</ind> <dep>0.40</dep></entry>
-                    <entry><ind>0.90</ind> <dep>1.00</dep></entry>
+                    <entry><ind>0.90</ind> <dep>0.80</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -450,7 +450,7 @@
                     <entry><ind>0.00</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.60</ind> <dep>0.05 </dep></entry>
                     <entry><ind>0.70</ind> <dep>0.40</dep></entry>
-                    <entry><ind>0.90</ind> <dep>1.00</dep></entry>
+                    <entry><ind>0.90</ind> <dep>0.80</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -982,7 +982,8 @@
                     <product><property>/engines/engine[0]/n1-actual</property><value>0.01</value></product>
                     <entry><ind>0.65</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.70</ind> <dep>0.10</dep></entry>
-					<entry><ind>1.02</ind> <dep>0.80</dep></entry>
+					<entry><ind>0.90</ind> <dep>0.40</dep></entry>
+					<entry><ind>1.02</ind> <dep>1.00</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -1011,7 +1012,8 @@
                     <product><property>/engines/engine[1]/n1-actual</property><value>0.01</value></product>
                     <entry><ind>0.65</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.70</ind> <dep>0.10</dep></entry>
-					<entry><ind>1.02</ind> <dep>0.80</dep></entry>
+					<entry><ind>0.90</ind> <dep>0.40</dep></entry>
+					<entry><ind>1.02</ind> <dep>1.00</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -1097,7 +1099,8 @@
                     <product><property>/engines/engine[0]/n1-actual</property><value>0.01</value></product>
                     <entry><ind>0.65</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.70</ind> <dep>0.10</dep></entry>
-					<entry><ind>1.02</ind> <dep>0.80</dep></entry>
+					<entry><ind>0.90</ind> <dep>0.40</dep></entry>
+					<entry><ind>1.02</ind> <dep>1.00</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -1126,7 +1129,8 @@
                     <product><property>/engines/engine[1]/n1-actual</property><value>0.01</value></product>
                     <entry><ind>0.65</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.70</ind> <dep>0.10</dep></entry>
-					<entry><ind>1.02</ind> <dep>0.80</dep></entry>
+					<entry><ind>0.90</ind> <dep>0.40</dep></entry>
+					<entry><ind>1.02</ind> <dep>1.00</dep></entry>
                 </table>
             </product>
         </expression>