diff --git a/HISTORY.md b/HISTORY.md
index 59fb22ac..bdf8fb5c 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -53,6 +53,7 @@
 * ported multiline library to new (custom input slot) format
 * new "text costumes" library for generating costumes from letters or words of text
 * took out "b block" costume from catalog
+* added microphone "resolution" concept governing "bins" (buffer / bin sizes)
 
 ### 2019-03-10
 * Objects, Blocks, Threads: added microphone note and pitch detection
diff --git a/snap.html b/snap.html
index f528fe5f..0981b360 100755
--- a/snap.html
+++ b/snap.html
@@ -6,9 +6,9 @@
         <link rel="shortcut icon" href="src/favicon.ico">
         <script type="text/javascript" src="src/morphic.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/widgets.js?version=2018-10-02"></script>
-        <script type="text/javascript" src="src/blocks.js?version=2019-03-10"></script>
-        <script type="text/javascript" src="src/threads.js?version=2019-03-10"></script>
-        <script type="text/javascript" src="src/objects.js?version=2019-03-10"></script>
+        <script type="text/javascript" src="src/blocks.js?version=2019-03-11"></script>
+        <script type="text/javascript" src="src/threads.js?version=2019-03-11"></script>
+        <script type="text/javascript" src="src/objects.js?version=2019-03-11"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-03-06"></script>
         <script type="text/javascript" src="src/paint.js?version=2019-02-22"></script>
         <script type="text/javascript" src="src/lists.js?version=2019-02-07"></script>
diff --git a/src/blocks.js b/src/blocks.js
index 9f122ff6..9b525a3f 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2019-March-10';
+modules.blocks = '2019-March-11';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -992,7 +992,9 @@ SyntaxElementMorph.prototype.labelPart = function (spec) {
                     'note' : ['note'],
                     'pitch' : ['pitch'],
                     'signals' : ['signals'],
-                    'frequencies' : ['frequencies']
+                    'frequencies' : ['frequencies'],
+                    '~' : null,
+                    'bins' : ['bins']
                 },
                 true // read-only
             );
diff --git a/src/objects.js b/src/objects.js
index 48bfa500..e8081b76 100644
--- a/src/objects.js
+++ b/src/objects.js
@@ -84,7 +84,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph, localize,
 TableMorph, TableFrameMorph, normalizeCanvas, BooleanSlotMorph, HandleMorph,
 AlignmentMorph, Process, XML_Element, VectorPaintEditorMorph*/
 
-modules.objects = '2019-March-10';
+modules.objects = '2019-March-11';
 
 var SpriteMorph;
 var StageMorph;
@@ -8871,8 +8871,7 @@ function Microphone() {
     this.analyser = null;
 
     // parameters:
-    this.signalBufferSize = 512; // should probably be 1024 by default
-    this.fftSize = 1024; // should probably be 2048 by default
+    this.resolution = 2;
     this.MIN_SAMPLES = 0;  // will be initialized when AudioContext is created.
     this.GOOD_ENOUGH_CORRELATION = 0.9;
 
@@ -8904,6 +8903,27 @@ Microphone.prototype.isOn = function () {
     return false;
 };
 
+// Microphone shared properties
+
+Microphone.prototype.binSizes = [256, 512, 1024, 2048, 4096];
+
+// Microphone resolution
+
+Microphone.prototype.binSize = function () {
+    return this.binSizes[this.resolution - 1];
+};
+
+Microphone.prototype.setResolution = function (num) {
+    if (contains([1, 2, 3, 4], num)) {
+        if (this.isReady) {
+            this.stop();
+            this.resolution = num;
+        }
+    }
+};
+
+// Microphone ops
+
 Microphone.prototype.start = function () {
     var AudioContext = window.AudioContext || window.webkitAudioContext,
         myself = this;
@@ -8964,7 +8984,7 @@ Microphone.prototype.setupNodes = function (stream) {
 Microphone.prototype.createAnalyser = function () {
     var freqBufLength;
     this.analyser = this.audioContext.createAnalyser();
-    this.analyser.fftSize = this.fftSize;
+    this.analyser.fftSize = this.binSizes[this.resolution];
     freqBufLength = this.analyser.frequencyBinCount;
     this.freqBuffer = new Uint8Array(freqBufLength);
     this.pitchBuffer = new Float32Array(freqBufLength);
@@ -8973,7 +8993,7 @@ Microphone.prototype.createAnalyser = function () {
 Microphone.prototype.createProcessor = function () {
     var myself = this;
     this.processor = this.audioContext.createScriptProcessor(
-        this.signalBufferSize
+        this.binSizes[this.resolution - 1]
     );
 
     this.processor.onaudioprocess = function (event) {
diff --git a/src/threads.js b/src/threads.js
index f381c5b1..4e6fd682 100644
--- a/src/threads.js
+++ b/src/threads.js
@@ -62,7 +62,7 @@ StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy,
 isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph, Color,
 TableFrameMorph, ColorSlotMorph, isSnapObject, Map*/
 
-modules.threads = '2019-March-10';
+modules.threads = '2019-March-11';
 
 var ThreadManager;
 var Process;
@@ -2252,9 +2252,13 @@ Process.prototype.doStopAllSounds = function () {
 // Process audio input (interpolated)
 
 Process.prototype.reportAudio = function (choice) {
-    var stage = this.blockReceiver().parentThatIsA(StageMorph);
+    var stage = this.blockReceiver().parentThatIsA(StageMorph),
+        selection = this.inputOption(choice);
+    if (selection === 'bins') {
+        return stage.microphone.binSize();
+    }
     if (stage.microphone.isOn()) {
-        switch (this.inputOption(choice)) {
+        switch (selection) {
         case 'volume':
             return stage.microphone.volume;
         case 'pitch':