diff --git a/HISTORY.md b/HISTORY.md
index 6dad76e5..3de11e4a 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -14,6 +14,7 @@
 
 ### 2022-03-03
 * SciSnap2 extension update (FFT), thanks, Eckart!
+* threads: removed experimental code
 
 ### 2022-03-02
 * gui: never close a dev-warning
diff --git a/snap.html b/snap.html
index 416420b0..f08ef42e 100755
--- a/snap.html
+++ b/snap.html
@@ -17,7 +17,7 @@
         <script src="src/symbols.js?version=2021-03-03"></script>
         <script src="src/widgets.js?version=2021-17-09"></script>
         <script src="src/blocks.js?version=2022-03-01"></script>
-        <script src="src/threads.js?version=2022-03-01"></script>
+        <script src="src/threads.js?version=2022-03-03"></script>
         <script src="src/objects.js?version=2022-03-01"></script>
         <script src="src/scenes.js?version=2021-11-24"></script>
         <script src="src/gui.js?version=2022-03-02"></script>
diff --git a/src/threads.js b/src/threads.js
index 05e9b00d..8f92174b 100644
--- a/src/threads.js
+++ b/src/threads.js
@@ -64,7 +64,7 @@ SnapExtensions, AlignmentMorph, TextMorph, Cloud, HatBlockMorph*/
 
 /*jshint esversion: 6*/
 
-modules.threads = '2022-March-01';
+modules.threads = '2022-March-03';
 
 var ThreadManager;
 var Process;
@@ -3413,48 +3413,6 @@ Process.prototype.decodeSound = function (sound, callback) {
     this.pushContext();
 };
 
-Process.prototype.decodeSpectrum = function (sound, callback) {
-    // private - callback is optional and invoked with sound as argument
-    var base64, binaryString, len, bytes, i, arrayBuffer, audioCtx, analyzer;
-
-    if (sound.audioBuffer) {
-        return (callback || nop)(sound);
-    }
-    if (!sound.isDecoding) {
-        base64 = sound.audio.src.split(',')[1];
-        binaryString = window.atob(base64);
-        len = binaryString.length;
-        bytes = new Uint8Array(len);
-        for (i = 0; i < len; i += 1)        {
-            bytes[i] = binaryString.charCodeAt(i);
-        }
-        arrayBuffer = bytes.buffer;
-        audioCtx = Note.prototype.getAudioContext();
-        sound.isDecoding = true;
-
-        analyser = audioCtx.createAnalyser(); // +++
-        analyser.fftSize = 256;
-        var bufferLength = analyser.frequencyBinCount;
-        var dataArray = new Uint8Array(bufferLength);
-        analyser.getByteFrequencyData(dataArray);
-
-
-        audioCtx.decodeAudioData(
-            arrayBuffer,
-            buffer => {
-                sound.audioBuffer = buffer;
-                sound.isDecoding = false;
-            },
-            err => {
-                sound.isDecoding = false;
-                this.handleError(err);
-            }
-        );
-    }
-    this.pushContext('doYield');
-    this.pushContext();
-};
-
 Process.prototype.encodeSound = function (samples, rate) {
     // private
     var rcvr = this.blockReceiver(),