diff --git a/js/moleculesandlight/view/MoleculesAndLightScreenView.js b/js/moleculesandlight/view/MoleculesAndLightScreenView.js
index 7babc8d2..cc54fa8b 100644
--- a/js/moleculesandlight/view/MoleculesAndLightScreenView.js
+++ b/js/moleculesandlight/view/MoleculesAndLightScreenView.js
@@ -69,6 +69,10 @@ define( require => {
   const infraredPhotonV3SoundInfo = require( 'sound!MOLECULES_AND_LIGHT/photon-v3-4th-interval-001.mp3' );
   const visiblePhotonV3SoundInfo = require( 'sound!MOLECULES_AND_LIGHT/photon-v3-4th-interval-002.mp3' );
   const ultravioletPhotonV3SoundInfo = require( 'sound!MOLECULES_AND_LIGHT/photon-v3-4th-interval-003.mp3' );
+  const microwavePhotonV3saSoundInfo = require( 'sound!MOLECULES_AND_LIGHT/photon-v3-4th-interval-000-softened-attack.mp3' );
+  const infraredPhotonV3saSoundInfo = require( 'sound!MOLECULES_AND_LIGHT/photon-v3-4th-interval-001-softened-attack.mp3' );
+  const visiblePhotonV3saSoundInfo = require( 'sound!MOLECULES_AND_LIGHT/photon-v3-4th-interval-002-softened-attack.mp3' );
+  const ultravioletPhotonV3saSoundInfo = require( 'sound!MOLECULES_AND_LIGHT/photon-v3-4th-interval-003-softened-attack.mp3' );
 
   // constants
   // Model-view transform for intermediate coordinates.
@@ -361,6 +365,12 @@ define( require => {
         new SoundClip( infraredPhotonV3SoundInfo, photonSoundClipOptions ),
         new SoundClip( visiblePhotonV3SoundInfo, photonSoundClipOptions ),
         new SoundClip( ultravioletPhotonV3SoundInfo, photonSoundClipOptions )
+      ],
+      [
+        new SoundClip( microwavePhotonV3saSoundInfo, photonSoundClipOptions ),
+        new SoundClip( infraredPhotonV3saSoundInfo, photonSoundClipOptions ),
+        new SoundClip( visiblePhotonV3saSoundInfo, photonSoundClipOptions ),
+        new SoundClip( ultravioletPhotonV3saSoundInfo, photonSoundClipOptions )
       ]
     ];
     photonEmissionSoundPlayers.forEach( soundSet => {
@@ -373,8 +383,6 @@ define( require => {
       if ( photon.locationProperty.value.x < 0 ) {
 
         // photon was emitted from lamp, use the initial emission sound
-        // soundSetIndex = malSoundOptionsDialogContent.photonInitialEmissionSoundSetProperty.value - 1;
-
         const playEmitFromLampSound = position => {
           if ( position.x >= PLAY_LAMP_EMISSION_X_POSITION ) {
             const soundSetIndex = malSoundOptionsDialogContent.photonInitialEmissionSoundSetProperty.value - 1;
diff --git a/js/moleculesandlight/view/malSoundOptionsDialogContent.js b/js/moleculesandlight/view/malSoundOptionsDialogContent.js
index de266818..98e5de22 100644
--- a/js/moleculesandlight/view/malSoundOptionsDialogContent.js
+++ b/js/moleculesandlight/view/malSoundOptionsDialogContent.js
@@ -64,7 +64,7 @@ define( require => {
         // radio button entries, but I've done it this way so that the sound families can be easily named if desired.
         const photonInitialEmissionRadioButtonGroup = new VerticalAquaRadioButtonGroup(
           this.photonInitialEmissionSoundSetProperty,
-          createNumberedRadioButtonDescriptorSet( 3 )
+          createNumberedRadioButtonDescriptorSet( 4 )
         );
         const photonInitialEmissionSoundSelectionPanel = new Panel(
           new VBox( {
@@ -78,7 +78,7 @@ define( require => {
         // Create the secondary photon emission radio buttons.
         const photonSecondaryEmissionRadioButtonGroup = new VerticalAquaRadioButtonGroup(
           this.photonSecondaryEmissionSoundSetProperty,
-          createNumberedRadioButtonDescriptorSet( 3 )
+          createNumberedRadioButtonDescriptorSet()
         );
         const photonSecondaryEmissionSoundSelectionPanel = new Panel(
           new VBox( {
diff --git a/sounds/license.json b/sounds/license.json
index 475a108f..0d58784f 100644
--- a/sounds/license.json
+++ b/sounds/license.json
@@ -87,6 +87,14 @@
     "license": "contact phethelp@colorado.edu",
     "notes": "created by Ashton Morris (PhET Interactive Simulations)"
   },
+  "photon-v3-4th-interval-000-softened-attack.mp3": {
+    "text": [
+      "Copyright 2018 University of Colorado Boulder"
+    ],
+    "projectURL": "http://phet.colorado.edu",
+    "license": "contact phethelp@colorado.edu",
+    "notes": "created by Ashton Morris (PhET Interactive Simulations)"
+  },
   "photon-v3-4th-interval-001.mp3": {
     "text": [
       "Copyright 2018 University of Colorado Boulder"
@@ -95,6 +103,14 @@
     "license": "contact phethelp@colorado.edu",
     "notes": "created by Ashton Morris (PhET Interactive Simulations)"
   },
+  "photon-v3-4th-interval-001-softened-attack.mp3": {
+    "text": [
+      "Copyright 2018 University of Colorado Boulder"
+    ],
+    "projectURL": "http://phet.colorado.edu",
+    "license": "contact phethelp@colorado.edu",
+    "notes": "created by Ashton Morris (PhET Interactive Simulations)"
+  },
   "photon-v3-4th-interval-002.mp3": {
     "text": [
       "Copyright 2018 University of Colorado Boulder"
@@ -103,6 +119,14 @@
     "license": "contact phethelp@colorado.edu",
     "notes": "created by Ashton Morris (PhET Interactive Simulations)"
   },
+  "photon-v3-4th-interval-002-softened-attack.mp3": {
+    "text": [
+      "Copyright 2018 University of Colorado Boulder"
+    ],
+    "projectURL": "http://phet.colorado.edu",
+    "license": "contact phethelp@colorado.edu",
+    "notes": "created by Ashton Morris (PhET Interactive Simulations)"
+  },
   "photon-v3-4th-interval-003.mp3": {
     "text": [
       "Copyright 2018 University of Colorado Boulder"
@@ -111,6 +135,14 @@
     "license": "contact phethelp@colorado.edu",
     "notes": "created by Ashton Morris (PhET Interactive Simulations)"
   },
+  "photon-v3-4th-interval-003-softened-attack.mp3": {
+    "text": [
+      "Copyright 2018 University of Colorado Boulder"
+    ],
+    "projectURL": "http://phet.colorado.edu",
+    "license": "contact phethelp@colorado.edu",
+    "notes": "created by Ashton Morris (PhET Interactive Simulations)"
+  },
   "rotate-002.mp3": {
     "text": [
       "Copyright 2018 University of Colorado Boulder"
diff --git a/sounds/photon-v3-4th-interval-000-softened-attack.mp3 b/sounds/photon-v3-4th-interval-000-softened-attack.mp3
new file mode 100644
index 00000000..3d2b106e
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diff --git a/sounds/photon-v3-4th-interval-001-softened-attack.mp3 b/sounds/photon-v3-4th-interval-001-softened-attack.mp3
new file mode 100644
index 00000000..7f404479
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diff --git a/sounds/photon-v3-4th-interval-002-softened-attack.mp3 b/sounds/photon-v3-4th-interval-002-softened-attack.mp3
new file mode 100644
index 00000000..82ef7198
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diff --git a/sounds/photon-v3-4th-interval-003-softened-attack.mp3 b/sounds/photon-v3-4th-interval-003-softened-attack.mp3
new file mode 100644
index 00000000..6bae7aa5
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