diff --git a/homepage/images/shift.svg b/homepage/images/shift.svg
new file mode 100644
index 0000000..ab89871
--- /dev/null
+++ b/homepage/images/shift.svg
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   id="Layer_1"
+   x="0px"
+   y="0px"
+   viewBox="0 0 330 330"
+   style="enable-background:new 0 0 330 330;"
+   xml:space="preserve"
+   sodipodi:docname="shift.svg"
+   inkscape:version="1.0.1 (c497b03c, 2020-09-10)"><metadata
+   id="metadata122"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
+   id="defs120" /><sodipodi:namedview
+   pagecolor="#ffffff"
+   bordercolor="#666666"
+   borderopacity="1"
+   objecttolerance="10"
+   gridtolerance="10"
+   guidetolerance="10"
+   inkscape:pageopacity="0"
+   inkscape:pageshadow="2"
+   inkscape:window-width="861"
+   inkscape:window-height="790"
+   id="namedview118"
+   showgrid="false"
+   inkscape:zoom="1.7878788"
+   inkscape:cx="165"
+   inkscape:cy="165"
+   inkscape:window-x="0"
+   inkscape:window-y="25"
+   inkscape:window-maximized="0"
+   inkscape:current-layer="Layer_1" />
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<text
+   xml:space="preserve"
+   style="font-style:normal;font-weight:normal;font-size:73.2664px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.83166"
+   x="83.402275"
+   y="106.78013"
+   id="text126"
+   transform="scale(0.82239993,1.2159534)"><tspan
+     sodipodi:role="line"
+     x="83.402275"
+     y="106.78013"
+     id="tspan128"
+     style="stroke-width:1.83166">FREQ</tspan><tspan
+     sodipodi:role="line"
+     x="83.402275"
+     y="198.36314"
+     id="tspan130"
+     style="stroke-width:1.83166">SHIFT</tspan></text></svg>
diff --git a/homepage/images/spinner.gif b/homepage/images/spinner.gif
new file mode 100644
index 0000000..b267d17
Binary files /dev/null and b/homepage/images/spinner.gif differ
diff --git a/homepage/images/unshift.svg b/homepage/images/unshift.svg
new file mode 100644
index 0000000..a04eb15
--- /dev/null
+++ b/homepage/images/unshift.svg
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   id="Layer_1"
+   x="0px"
+   y="0px"
+   viewBox="0 0 330 330"
+   style="enable-background:new 0 0 330 330;"
+   xml:space="preserve"
+   sodipodi:docname="unshift.svg"
+   inkscape:version="1.0.1 (c497b03c, 2020-09-10)"><metadata
+   id="metadata122"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
+   id="defs120" /><sodipodi:namedview
+   pagecolor="#ffffff"
+   bordercolor="#666666"
+   borderopacity="1"
+   objecttolerance="10"
+   gridtolerance="10"
+   guidetolerance="10"
+   inkscape:pageopacity="0"
+   inkscape:pageshadow="2"
+   inkscape:window-width="861"
+   inkscape:window-height="790"
+   id="namedview118"
+   showgrid="false"
+   inkscape:zoom="1.7878788"
+   inkscape:cx="165"
+   inkscape:cy="165"
+   inkscape:window-x="0"
+   inkscape:window-y="25"
+   inkscape:window-maximized="0"
+   inkscape:current-layer="Layer_1" />
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<text
+   xml:space="preserve"
+   style="font-style:normal;font-weight:normal;font-size:73.2664px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.83166"
+   x="39.195156"
+   y="115.05988"
+   id="text126"
+   transform="scale(0.82239993,1.2159534)"><tspan
+     sodipodi:role="line"
+     x="39.195156"
+     y="115.05988"
+     id="tspan128"
+     style="stroke-width:1.83166">  FREQ</tspan><tspan
+     sodipodi:role="line"
+     x="39.195156"
+     y="206.64288"
+     id="tspan130"
+     style="stroke-width:1.83166">UNSHIFT</tspan></text></svg>
diff --git a/scripts/play.php b/scripts/play.php
index dc3f591..0143632 100644
--- a/scripts/play.php
+++ b/scripts/play.php
@@ -97,6 +97,31 @@ if(isset($_GET['excludefile'])) {
   }
 }
 
+$shifted_path = $home."/BirdSongs/Extracted/By_Date/shifted/";
+
+if(isset($_GET['shiftfile'])) {
+    $filename = $_GET['shiftfile'];
+    if(isset($_GET['shiftfreq'])) {
+	$pp = pathinfo($filename);
+	$dir = $pp['dirname'];
+	$fn  = $pp['filename'];
+	$ext = $pp['extension'];
+        $pi = $home."/BirdSongs/Extracted/By_Date/";
+        $cmd = "/usr/bin/nohup /usr/bin/ffmpeg -y -i \"".$pi.$filename."\" -af \"rubberband=pitch=2500/6000\" \"".$shifted_path.$filename."\"";
+	shell_exec("mkdir -p ".$shifted_path.$dir." && echo \"".$cmd."\" > /tmp/shift.sh && chmod +x /tmp/shift.sh");
+	shell_exec("/tmp/shift.sh");
+	shell_exec("rm -f /tmp/shift.sh");
+    } else {
+	$cmd = "rm -f " . $shifted_path.$dir.$filename;
+	shell_exec("echo \"".$cmd."\" > /tmp/rmshift.sh && chmod +x /tmp/rmshift.sh");
+	shell_exec("/tmp/rmshift.sh");
+	shell_exec("rm -f /tmp/rmshift.sh");
+    }
+
+    echo "OK";
+    die();
+}
+
 if(isset($_GET['bydate'])){
   $statement = $db->prepare('SELECT DISTINCT(Date) FROM detections GROUP BY Date ORDER BY Date DESC');
   if($statement == False){
@@ -208,6 +233,45 @@ function toggleLock(filename, type, elem) {
     xhttp.open("GET", "play.php?excludefile="+filename+"&exclude_del=true", true);  
   }
   xhttp.send();
+  elem.setAttribute("src","images/spinner.gif");
+}
+
+function toggleShiftFreq(filename, shiftAction, elem) {
+  const xhttp = new XMLHttpRequest();
+  xhttp.onload = function() {
+    if(this.responseText == "OK"){
+      if(shiftAction == "shift") {
+        elem.setAttribute("src","images/unshift.svg");
+        elem.setAttribute("title", "This file has been shifted down in frequency.");
+        elem.setAttribute("onclick", elem.getAttribute("onclick").replace("shift","unshift"));
+        console.log("shifted freqs of " + filename);
+	video=elem.parentNode.getElementsByTagName("video")[0];
+	video.setAttribute("title", video.getAttribute("title").replace("/By_Date/","/By_Date/shifted/"));
+	source = video.getElementsByTagName("source")[0];
+	source.setAttribute("src", source.getAttribute("src").replace("/By_Date/","/By_Date/shifted/"));
+	video.load();
+      } else {
+        elem.setAttribute("src","images/shift.svg");
+        elem.setAttribute("title", "This file is not shifted in frequency.");
+        elem.setAttribute("onclick", elem.getAttribute("onclick").replace("unshift","shift"));
+        console.log("unshifted freqs of " + filename);
+	video=elem.parentNode.getElementsByTagName("video")[0];
+	video.setAttribute("title", video.getAttribute("title").replace("/By_Date/shifted/","/By_Date/"));
+	source = video.getElementsByTagName("source")[0];
+	source.setAttribute("src", source.getAttribute("src").replace("/By_Date/shifted/","/By_Date/"));
+	video.load();
+      }
+    }
+  }
+  if(shiftAction == "shift") {
+    console.log("shifting freqs of " + filename);
+    xhttp.open("GET", "play.php?shiftfile="+filename+"&shiftfreq=true", true);
+  } else {
+    console.log("unshifting freqs of " + filename);
+    xhttp.open("GET", "play.php?shiftfile="+filename, true);  
+  }
+  xhttp.send();
+  elem.setAttribute("src","images/spinner.gif");
 }
 </script>
 
@@ -331,6 +395,8 @@ echo "<table>
     $comname = preg_replace('/\'/', '', $comname);
     $date = $results['Date'];
     $filename = "/By_Date/".$date."/".$comname."/".$results['File_Name'];
+    $filename_shifted = "/By_Date/shifted/".$date."/".$comname."/".$results['File_Name'];
+    $filename_png = $filename . ".png";
     $sciname = preg_replace('/ /', '_', $results['Sci_Name']);
     $sci_name = $results['Sci_Name'];
     $time = $results['Time'];
@@ -357,14 +423,31 @@ echo "<table>
         $type = "del";
       }
 
+      if(file_exists($shifted_path.$filename_formatted)) {
+        $shiftImageIcon = "images/unshift.svg";
+        $shiftTitle = "This file has been shifted down in frequency."; 
+        $shiftAction = "unshift";
+	$filename = $filename_shifted;
+      } else {
+        $shiftImageIcon = "images/shift.svg";
+        $shiftTitle = "This file is not shifted in frequency.";
+        $shiftAction = "shift";
+      }
+
       echo "<tr>
-        <td class=\"relative\"><img style='cursor:pointer;right:45px' src='images/delete.svg' onclick='deleteDetection(\"".$filename_formatted."\")' class=\"copyimage\" width=25 title='Delete Detection'> <img style='cursor:pointer' onclick='toggleLock(\"".$filename_formatted."\",\"".$type."\", this)' class=\"copyimage\" width=25 title=\"".$title."\" src=\"".$imageicon."\">$date $time<br>$confidence<br>
-        <video onplay='setLiveStreamVolume(0)' onended='setLiveStreamVolume(1)' onpause='setLiveStreamVolume(1)' controls poster=\"$filename.png\" preload=\"none\" title=\"$filename\"><source src=\"$filename\"></video></td>
+	<td class=\"relative\"> 
+
+<img style='cursor:pointer;right:90px' src='images/delete.svg' onclick='deleteDetection(\"".$filename_formatted."\")' class=\"copyimage\" width=25 title='Delete Detection'> 
+<img style='cursor:pointer;right:45px' onclick='toggleLock(\"".$filename_formatted."\",\"".$type."\", this)' class=\"copyimage\" width=25 title=\"".$title."\" src=\"".$imageicon."\"> 
+<img style='cursor:pointer' onclick='toggleShiftFreq(\"".$filename_formatted."\",\"".$shiftAction."\", this)' class=\"copyimage\" width=25 title=\"".$shiftTitle."\" src=\"".$shiftImageIcon."\"> $date $time<br>$confidence<br>
+
+        <video onplay='setLiveStreamVolume(0)' onended='setLiveStreamVolume(1)' onpause='setLiveStreamVolume(1)' controls poster=\"$filename_png\" preload=\"none\" title=\"$filename\"><source src=\"$filename\"></video></td>
         </tr>";
     } else {
       echo "<tr>
-        <td class=\"relative\">$date $time<br>$confidence<img style='cursor:pointer' src='images/delete.svg' onclick='deleteDetection(\"".$filename_formatted."\")' class=\"copyimage\" width=25 title='Delete Detection'><br>
-        <video onplay='setLiveStreamVolume(0)' onended='setLiveStreamVolume(1)' onpause='setLiveStreamVolume(1)' controls poster=\"$filename.png\" preload=\"none\" title=\"$filename\"><source src=\"$filename\"></video></td>
+	<td class=\"relative\">$date $time<br>$confidence
+<img style='cursor:pointer' src='images/delete.svg' onclick='deleteDetection(\"".$filename_formatted."\")' class=\"copyimage\" width=25 title='Delete Detection'><br>
+        <video onplay='setLiveStreamVolume(0)' onended='setLiveStreamVolume(1)' onpause='setLiveStreamVolume(1)' controls poster=\"$filename_png\" preload=\"none\" title=\"$filename\"><source src=\"$filename\"></video></td>
         </tr>";
     }
 
@@ -388,6 +471,8 @@ echo "<table>
         $comname = preg_replace('/\'/', '', $comname);
         $date = $results['Date'];
         $filename = "/By_Date/".$date."/".$comname."/".$results['File_Name'];
+        $filename_shifted = "/By_Date/shifted/".$date."/".$comname."/".$results['File_Name'];
+        $filename_png = $filename . ".png";
         $sciname = preg_replace('/ /', '_', $results['Sci_Name']);
         $sci_name = $results['Sci_Name'];
         $time = $results['Time'];
@@ -411,14 +496,31 @@ echo "<table>
             $type = "del";
           }
 
+      if(file_exists($shifted_path.$filename_formatted)) {
+        $shiftImageIcon = "images/unshift.svg";
+        $shiftTitle = "This file has been shifted down in frequency."; 
+        $shiftAction = "unshift";
+	$filename = $filename_shifted;
+      } else {
+        $shiftImageIcon = "images/shift.svg";
+        $shiftTitle = "This file is not shifted in frequency.";
+        $shiftAction = "shift";
+      }
+
           echo "<tr>
-            <td class=\"relative\"><img style='cursor:pointer;right:45px' src='images/delete.svg' onclick='deleteDetection(\"".$filename_formatted."\", true)' class=\"copyimage\" width=25 title='Delete Detection'> <img style='cursor:pointer' onclick='toggleLock(\"".$filename_formatted."\",\"".$type."\", this)' class=\"copyimage\" width=25 title=\"".$title."\" src=\"".$imageicon."\">$date $time<br>$confidence<br>
-            <video onplay='setLiveStreamVolume(0)' onended='setLiveStreamVolume(1)' onpause='setLiveStreamVolume(1)' controls poster=\"$filename.png\" preload=\"none\" title=\"$filename\"><source src=\"$filename\"></video></td>
+	    <td class=\"relative\"> 
+
+<img style='cursor:pointer;right:90px' src='images/delete.svg' onclick='deleteDetection(\"".$filename_formatted."\", true)' class=\"copyimage\" width=25 title='Delete Detection'> 
+<img style='cursor:pointer;right:45px' onclick='toggleLock(\"".$filename_formatted."\",\"".$type."\", this)' class=\"copyimage\" width=25 title=\"".$title."\" src=\"".$imageicon."\"> 
+<img style='cursor:pointer' onclick='toggleShiftFreq(\"".$filename_formatted."\",\"".$shiftAction."\", this)' class=\"copyimage\" width=25 title=\"".$shiftTitle."\" src=\"".$shiftImageIcon."\">$date $time<br>$confidence<br>
+
+<video onplay='setLiveStreamVolume(0)' onended='setLiveStreamVolume(1)' onpause='setLiveStreamVolume(1)' controls poster=\"$filename_png\" preload=\"none\" title=\"$filename\"><source src=\"$filename\"></video></td>
             </tr>";
         } else {
           echo "<tr>
-            <td class=\"relative\">$date $time<br>$confidence<img style='cursor:pointer' src='images/delete.svg' onclick='deleteDetection(\"".$filename_formatted."\", true)' class=\"copyimage\" width=25 title='Delete Detection'><br>
-            <video onplay='setLiveStreamVolume(0)' onended='setLiveStreamVolume(1)' onpause='setLiveStreamVolume(1)' controls poster=\"$filename.png\" preload=\"none\" title=\"$filename\"><source src=\"$filename\"></video></td>
+	    <td class=\"relative\">$date $time<br>$confidence
+<img style='cursor:pointer' src='images/delete.svg' onclick='deleteDetection(\"".$filename_formatted."\", true)' class=\"copyimage\" width=25 title='Delete Detection'><br>
+            <video onplay='setLiveStreamVolume(0)' onended='setLiveStreamVolume(1)' onpause='setLiveStreamVolume(1)' controls poster=\"$filename_png\" preload=\"none\" title=\"$filename\"><source src=\"$filename\"></video></td>
             </tr>";
         }