diff --git a/SLUB_mediaconch_policy_retrodigitized_audio.xml b/SLUB_mediaconch_policy_retrodigitized_audio.xml
index f5c219300f53e2d4c97afa1c76864545114553c5..dc1cae6f7da79d29c05b6ca5b91c58e33c987cdc 100644
--- a/SLUB_mediaconch_policy_retrodigitized_audio.xml
+++ b/SLUB_mediaconch_policy_retrodigitized_audio.xml
@@ -1,39 +1,54 @@
 <?xml version="1.0"?>
-<policy type="or" name="SLUB Policy for MKV/linear PCM, retrodigitized audio" license="CC-BY-SA-4.0+">
+<policy type="or" name="SLUB Policy for MKV/linear PCM, retrodigitized audio"
+  license="CC-BY-SA-4.0+">
   <description>SLUB related policy to test that the audio file is suitable for archiving purposes.
-    This checks if a MKV/linear PCM fulfills the needs for Audio retrodigitization:
-    - Container format is Matroska with error detection (CRC)
-    - Audio format is PCM (unfortunately it can not contain error detection) or FLAC (it has CRC by design)
-    This policy is based on:
-    - Example MKV FFV1 digitization policy.xml
-    - Video file is MKV + FFV1-Intra + PCM or FLAC with CRC32 everywhere.xml
-    If there are any policy violations or suggestions, please send an email to langzeitarchiv@slub-dresden.de
-  </description>
+    This checks if a MKV/linear PCM fulfills the needs for Audio retrodigitization: - Container
+    format is Matroska with error detection (CRC) - Audio format is PCM (unfortunately it can not
+    contain error detection) or FLAC (it has CRC by design) This policy is based on: - Example MKV
+    FFV1 digitization policy.xml - Video file is MKV + FFV1-Intra + PCM or FLAC with CRC32
+    everywhere.xml If there are any policy violations or suggestions, please send an email to
+    langzeitarchiv@slub-dresden.de </description>
   <policy type="and" name="MKV, FFV1 Intra, PCM/FLAC, error detection">
     <policy type="and" name="Container">
-      <rule name="General/FileExtension is mkv" value="FileExtension" tracktype="General" occurrence="*" operator="=">mkv</rule>
-      <rule name="Container is MKV" value="Format" tracktype="General" occurrence="*" operator="=">Matroska</rule>
+      <policy type="or" name="FileExtension">
+        <rule name="General/FileExtension is mkv" value="FileExtension" tracktype="General"
+          occurrence="*" operator="=">mkv</rule>
+        <rule name="General/FileExtension is mka" value="FileExtension" tracktype="General"
+          occurrence="*" operator="=">mka</rule>
+      </policy>
+      <rule name="Container is MKV" value="Format" tracktype="General" occurrence="*" operator="="
+        >Matroska</rule>
       <rule name="Unique ID is present" value="UniqueID" tracktype="General" occurrence="*"/>
-      <rule name="Container uses error detection" value="extra/ErrorDetectionType" tracktype="General" occurrence="*" operator="=">Per level 1</rule>
-      <rule name="General/Format_Version is 4" value="Format_Version" tracktype="General" occurrence="*" operator="=">4</rule>
-      
+      <rule name="Container uses error detection" value="extra/ErrorDetectionType"
+        tracktype="General" occurrence="*" operator="=">Per level 1</rule>
+      <rule name="General/Format_Version is 4" value="Format_Version" tracktype="General"
+        occurrence="*" operator="=">4</rule>
+
     </policy>
 
-    <policy type="or" name="Audio">
-      <rule name="General/AudioCount is 1" value="AudioCount" tracktype="General" occurrence="*" operator="=">1</rule>
+    <policy type="and" name="Audio">
+      <rule name="General/AudioCount is 1" value="AudioCount" tracktype="General" occurrence="*"
+        operator="=">1</rule>
       <policy type="or" name="Audio is PCM or FLAC">
-        <rule name="Audio is PCM" value="Format" tracktype="Audio" occurrence="*" operator="=">PCM</rule>
-        <rule name="Audio is FLAC" value="Format" tracktype="Audio" occurrence="*" operator="=">FLAC</rule>
+        <rule name="Audio is PCM" value="Format" tracktype="Audio" occurrence="*" operator="="
+          >PCM</rule>
+        <rule name="Audio is FLAC" value="Format" tracktype="Audio" occurrence="*" operator="="
+          >FLAC</rule>
       </policy>
-      <rule name="Audio is 48000 Hz" value="SamplingRate" tracktype="Audio" occurrence="*" operator="=">48000</rule>
-      <policy type="or" name="Audio is Stereo or Mono">
-        <rule name="Audio is mono" value="Channels" tracktype="Audio" occurrence="*" operator="=">1</rule>
-        <rule name="Audio is stereo" value="Channels" tracktype="Audio" occurrence="*" operator="=">2</rule>
+      <policy name="Audio is multiple of 48kHz" type="or">
+        <rule name="Audio is 48000 Hz" value="SamplingRate" tracktype="Audio" occurrence="*"
+          operator="=">48000</rule>
+        <rule name="Audio is 96000 Hz" value="SamplingRate" tracktype="Audio" occurrence="*"
+          operator="=">96000</rule>
       </policy>
-      <policy type="or" name="Audio Bit Depth is 16 or 24">
-        <rule name="Bit Depth is 16" value="BitDepth" tracktype="Audio" occurrence="*" operator="=">16</rule>
-        <rule name="Bit Depth is 24" value="BitDepth" tracktype="Audio" occurrence="*" operator="=">24</rule>
+      <policy type="or" name="Audio is Stereo or Mono">
+        <rule name="Audio is mono" value="Channels" tracktype="Audio" occurrence="*" operator="="
+          >1</rule>
+        <rule name="Audio is stereo" value="Channels" tracktype="Audio" occurrence="*" operator="="
+          >2</rule>
       </policy>
+      <rule name="Bit Depth is 24" value="BitDepth" tracktype="Audio" occurrence="*" operator="="
+        >24</rule>
     </policy>
   </policy>
 </policy>