Remove suggestion to "duck" less-important audio/dialogue

Author: patrickhlauke

understanding/20/audio-description-or-media-alternative-prerecorded.html

@@ -23,9 +23,7 @@ <h2>Intent of Audio Description or Media Alternative (Prerecorded)</h2>
          video portion is not available. Audio description provides information about actions,
          characters, scene changes, and on-screen text that are important and are not described
          or spoken in the main sound track. Audio description is usually added during existing
-         pauses in dialogue. In rare cases where the original audio does not provide sufficient
-         pauses, it may be possible to create them by lowering the volume ("ducking") some of the
-         existing dialogue, if the need for audio description is deemed to be more important.
+         pauses in dialogue.
       </p>
 
       <p>The second approach involves providing all of the information in the synchronized

understanding/20/audio-description-prerecorded.html

@@ -19,9 +19,7 @@ <h2>Intent of Audio Description (Prerecorded)</h2>
          needed when the video portion is not available. Audio description provides information about actions,
          characters, scene changes, and on-screen text that are important and are not described
          or spoken in the main sound track. Audio description is usually added during existing
-         pauses in dialogue. In rare cases where the original audio does not provide sufficient
-         pauses, it may be possible to create them by lowering the volume ("ducking") some of the
-         existing dialogue, if the need for audio description is deemed to be more important.
+         pauses in dialogue.
       </p>
 
       <div class="note">