diff --git a/Sounds/A320-common-sound.xml b/Sounds/A320-common-sound.xml
index 8324a945..80137d43 100644
--- a/Sounds/A320-common-sound.xml
+++ b/Sounds/A320-common-sound.xml
@@ -32,6 +32,7 @@
 				<property>/systems/apu/rpm</property>
 				<factor>0.005</factor>
 				<min>0</min>
+				<max>0.3</max>
 			</volume>
 			<pitch>
 				<property>/systems/apu/rpm</property>
diff --git a/Systems/cfm56-sound.xml b/Systems/cfm56-sound.xml
index 510bc19f..66900d95 100644
--- a/Systems/cfm56-sound.xml
+++ b/Systems/cfm56-sound.xml
@@ -20,7 +20,7 @@
                     <entry><ind>0.00</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.40</ind> <dep>0.10</dep></entry>
                     <entry><ind>0.55</ind> <dep>0.30</dep></entry>
-                    <entry><ind>0.75</ind> <dep>1.00</dep></entry>
+                    <entry><ind>0.75</ind> <dep>0.60</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -82,7 +82,7 @@
                     <entry><ind>0.00</ind> <dep>0.00</dep></entry>
 					<entry><ind>0.40</ind> <dep>0.10</dep></entry>
                     <entry><ind>0.55</ind> <dep>0.30</dep></entry>
-                    <entry><ind>0.75</ind> <dep>1.00</dep></entry>
+                    <entry><ind>0.75</ind> <dep>0.60</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -269,7 +269,7 @@
                     <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>0.20</dep></entry>
-                    <entry><ind>0.90</ind> <dep>0.70</dep></entry>
+                    <entry><ind>0.90</ind> <dep>0.60</dep></entry>
                 </table>
             </product>
         </expression> 
@@ -329,7 +329,7 @@
                     <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>0.20</dep></entry>
-                    <entry><ind>0.90</ind> <dep>0.70</dep></entry>
+                    <entry><ind>0.90</ind> <dep>0.60</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>0.80</dep></entry>
+                    <entry><ind>0.90</ind> <dep>0.60</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>0.80</dep></entry>
+                    <entry><ind>0.90</ind> <dep>0.60</dep></entry>
                 </table>
             </product>
         </expression>