diff --git a/js/molecules-and-light-main.js b/js/molecules-and-light-main.js
index 21d80abb..4b14d16b 100644
--- a/js/molecules-and-light-main.js
+++ b/js/molecules-and-light-main.js
@@ -26,7 +26,7 @@ define( require => {
     keyboardHelpNode: keyboardHelpContent,
 
     createOptionsDialogContent: phet.chipper.queryParameters.supportsSound ?
-                                () => { return malSoundOptionsDialogContent; } :
+                                () => { return malSoundOptionsDialogContent.getContent(); } :
                                 null,
 
     credits: {
diff --git a/js/moleculesandlight/view/malSoundOptionsDialogContent.js b/js/moleculesandlight/view/malSoundOptionsDialogContent.js
index ef799641..b7a6b3e3 100644
--- a/js/moleculesandlight/view/malSoundOptionsDialogContent.js
+++ b/js/moleculesandlight/view/malSoundOptionsDialogContent.js
@@ -36,44 +36,65 @@ define( require => {
    * @param {Node} content - content for the dialog
    * @param {Tandem} tandem
    */
-  class MALSoundOptionsDialogContent extends Node {
+  class MALSoundOptionsDialogContent {
 
     constructor() {
-      super();
 
       // @public (read-only)
       this.photonSoundSetProperty = new NumberProperty( 3 );
 
-      // Create the radio buttons.  I (jbphet) know that it's a bit silly to have numbers for radio button entries, but
-      // I've done it this way so that the sound families can be easily named if desired.
-      const oneRadioButton = new AquaRadioButton(
-        this.photonSoundSetProperty,
-        1,
-        new Text( '1', RADIO_BUTTON_TEXT_OPTIONS ),
-        { tandem: Tandem.optional }
-      );
-      const twoRadioButton = new AquaRadioButton(
-        this.photonSoundSetProperty,
-        2,
-        new Text( '2', RADIO_BUTTON_TEXT_OPTIONS ),
-        { tandem: Tandem.optional }
-      );
-      const threeRadioButton = new AquaRadioButton(
-        this.photonSoundSetProperty,
-        3,
-        new Text( '3', RADIO_BUTTON_TEXT_OPTIONS ),
-        { tandem: Tandem.optional }
-      );
-
-      this.addChild( new VBox( {
-        children: [
-          new Text( 'Photon Sound Family', { font: new PhetFont( 20 ), weight: 'bold' } ),
-          oneRadioButton,
-          twoRadioButton,
-          threeRadioButton
-        ],
-        align: 'left'
-      } ) );
+      // @private {Node} - dialog content, created when requested, see explanation below
+      this.dialogContent = null;
+
+
+    }
+
+    /**
+     * Get the content, which consists of the UI controls to set the sound options.  This can't be created during
+     * construction because the creation process references the phet.joist.sim.supportsSound flag, which isn't availabe
+     * at RequireJS load time.
+     * @returns {Node}
+     * @public
+     */
+    getContent() {
+
+      if ( !this.dialogContent ) {
+
+        this.dialogContent = new Node();
+
+        // Create the radio buttons.  I (jbphet) know that it's a bit silly to have numbers for radio button entries,
+        // but I've done it this way so that the sound families can be easily named if desired.
+        const oneRadioButton = new AquaRadioButton(
+          this.photonSoundSetProperty,
+          1,
+          new Text( '1', RADIO_BUTTON_TEXT_OPTIONS ),
+          { tandem: Tandem.optional }
+        );
+        const twoRadioButton = new AquaRadioButton(
+          this.photonSoundSetProperty,
+          2,
+          new Text( '2', RADIO_BUTTON_TEXT_OPTIONS ),
+          { tandem: Tandem.optional }
+        );
+        const threeRadioButton = new AquaRadioButton(
+          this.photonSoundSetProperty,
+          3,
+          new Text( '3', RADIO_BUTTON_TEXT_OPTIONS ),
+          { tandem: Tandem.optional }
+        );
+
+        this.dialogContent.addChild( new VBox( {
+          children: [
+            new Text( 'Photon Sound Family', { font: new PhetFont( 20 ), weight: 'bold' } ),
+            oneRadioButton,
+            twoRadioButton,
+            threeRadioButton
+          ],
+          align: 'left'
+        } ) );
+      }
+
+      return this.dialogContent;
     }
   }