Add note properties panel and human-readable pitch/timing to editor

When a note is selected, a properties panel now appears with:
- Pitch input (type note names like C4, D#5, Bb3)
- Duration dropdown (whole, half, quarter, eighth, etc.)
- Lane selector dropdown

Code view now shows pitch names and duration names as comments
next to each note for easy reading. Export includes pitch/duration
names. Import and Apply Code accept note name strings in the f field.

https://claude.ai/code/session_018SvBLznyTuvoZAYCw9WwAA

index.html

@@ -214,6 +214,39 @@ canvas{display:block;}
     Click=select | Dbl-click=add note | Drag=move | Drag edge=resize | 1-5=note value | Shift+↑↓=pitch | ↑↓=lane | ←→=nudge time | D=+dur | Shift+D=-dur | Shift+drag=select range | Ctrl+C/V=copy/paste | Del=delete | Scroll=pan | Click header=set start | Dbl-click header=play from there
     <span id="ed-mode-label" style="margin-left:12px;color:#805ad5;"></span>
   </div>
+  <!-- Note Properties Panel (appears when a note is selected) -->
+  <div id="ed-note-panel" style="display:none;padding:6px 12px;background:#0d0d18;border-bottom:1px solid #333;flex-shrink:0;">
+    <div style="display:flex;gap:12px;align-items:center;flex-wrap:wrap;">
+      <span style="color:#aaa;font-size:12px;font-weight:bold;">Selected Note:</span>
+      <label style="color:#aaa;font-size:12px;">Pitch:
+        <input type="text" id="ed-note-pitch" placeholder="e.g. C4, D#5, Bb3" style="width:70px;background:#1a1a2e;color:#ff0;border:1px solid #444;padding:2px 4px;border-radius:3px;font-family:monospace;font-size:12px;" onchange="edSetPitch(this.value)">
+      </label>
+      <label style="color:#aaa;font-size:12px;">Duration:
+        <select id="ed-note-dur" style="background:#1a1a2e;color:#fff;border:1px solid #444;padding:2px;border-radius:3px;font-size:12px;" onchange="edSetDuration(this.value)">
+          <option value="0">— (instant)</option>
+          <option value="whole">𝅝 Whole</option>
+          <option value="dotted-half">𝅗𝅥. Dotted Half</option>
+          <option value="half">𝅗𝅥 Half</option>
+          <option value="dotted-quarter">♩. Dotted Quarter</option>
+          <option value="quarter">♩ Quarter</option>
+          <option value="dotted-eighth">♪. Dotted Eighth</option>
+          <option value="eighth">♪ Eighth</option>
+          <option value="sixteenth">♬ Sixteenth</option>
+          <option value="32nd">♬♬ 32nd</option>
+        </select>
+      </label>
+      <label style="color:#aaa;font-size:12px;">Lane:
+        <select id="ed-note-lane" style="background:#1a1a2e;color:#fff;border:1px solid #444;padding:2px;border-radius:3px;font-size:12px;" onchange="edSetLane(this.value)">
+          <option value="0" style="color:#e53e3e">0 - Red</option>
+          <option value="1" style="color:#d69e2e">1 - Yellow</option>
+          <option value="2" style="color:#3182ce">2 - Blue</option>
+          <option value="3" style="color:#38a169">3 - Green</option>
+          <option value="4" style="color:#805ad5">4 - Kick</option>
+        </select>
+      </label>
+      <span id="ed-note-info" style="color:#666;font-size:11px;font-family:monospace;"></span>
+    </div>
+  </div>
   <div id="ed-code-panel" style="display:none;padding:8px 12px;background:#0a0a14;border-bottom:1px solid #333;overflow-y:auto;flex-shrink:0;max-height:45vh;">
     <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:4px;">
       <span style="color:#888;font-size:11px;">JavaScript — edit and click "Apply Code" to update the timeline. Drag bottom edge to resize.</span>
@@ -4912,6 +4945,112 @@ function edFreqToNote(freq){
   return best;
 }
 
+// Note name to frequency (reverse of edFreqToNote)
+// Accepts: C4, D#5, Db3, Eb4, F#3, Bb2, etc.
+function edNoteToFreq(name){
+  if(!name||name==="?")return 0;
+  name=name.trim();
+  var match=name.match(/^([A-Ga-g])(#{1,2}|b{1,2}|♯|♭)?(\d)$/);
+  if(!match)return 0;
+  var letter=match[1].toUpperCase();
+  var accidental=match[2]||"";
+  var octave=parseInt(match[3]);
+  var semitones={"C":0,"D":2,"E":4,"F":5,"G":7,"A":9,"B":11}[letter];
+  if(semitones===undefined)return 0;
+  if(accidental==="#"||accidental==="♯")semitones+=1;
+  else if(accidental==="##")semitones+=2;
+  else if(accidental==="b"||accidental==="♭")semitones-=1;
+  else if(accidental==="bb")semitones-=2;
+  // MIDI note number: C4=60, A4=69
+  var midi=(octave+1)*12+semitones;
+  return parseFloat((440*Math.pow(2,(midi-69)/12)).toFixed(2));
+}
+
+// Duration name to seconds
+function edDurNameToSec(name){
+  var q=edQuarterSec();
+  var map={"whole":q*4,"dotted-half":q*3,"half":q*2,"dotted-quarter":q*1.5,"quarter":q,"dotted-eighth":q*0.75,"eighth":q/2,"sixteenth":q/4,"32nd":q/8};
+  return map[name]||0;
+}
+
+// Duration seconds to name (for dropdown selection)
+function edDurSecToName(durSec){
+  if(!durSec||durSec<=0)return "0";
+  var q=edQuarterSec();
+  var ratio=durSec/q;
+  if(ratio>=3.5) return "whole";
+  if(ratio>=2.5) return "dotted-half";
+  if(ratio>=1.8) return "half";
+  if(ratio>=1.3) return "dotted-quarter";
+  if(ratio>=0.8) return "quarter";
+  if(ratio>=0.6) return "dotted-eighth";
+  if(ratio>=0.4) return "eighth";
+  if(ratio>=0.2) return "sixteenth";
+  return "32nd";
+}
+
+// Update note properties panel when selection changes
+function edUpdateNotePanel(){
+  var panel=document.getElementById("ed-note-panel");
+  if(edSelected<0||edSelected>=edMelody.length){
+    panel.style.display="none";
+    return;
+  }
+  panel.style.display="block";
+  var m=edMelody[edSelected];
+  // Pitch input
+  var pitchInput=document.getElementById("ed-note-pitch");
+  pitchInput.value=m.f?edFreqToNote(m.f):"";
+  // Duration dropdown
+  var durSel=document.getElementById("ed-note-dur");
+  durSel.value=edDurSecToName(m.d||0);
+  // Lane dropdown
+  document.getElementById("ed-note-lane").value=m.l;
+  // Info line
+  var info="t="+m.t.toFixed(3)+"s";
+  if(m.f)info+=" | freq="+m.f.toFixed(1)+"Hz";
+  if(m.d>0)info+=" | dur="+m.d.toFixed(3)+"s";
+  document.getElementById("ed-note-info").textContent=info;
+  // Resize canvas since panel may have appeared
+  setTimeout(edResize,30);
+}
+
+// Set pitch from note panel input
+function edSetPitch(val){
+  if(edSelected<0)return;
+  var freq=edNoteToFreq(val);
+  if(freq>0){
+    edMelody[edSelected].f=freq;
+  }else if(val.trim()===""){
+    delete edMelody[edSelected].f;
+  }else{
+    document.getElementById("ed-note-info").textContent="Invalid pitch — use e.g. C4, D#5, Bb3";
+    return;
+  }
+  edDraw();
+  edUpdateNotePanel();
+}
+
+// Set duration from note panel dropdown
+function edSetDuration(val){
+  if(edSelected<0)return;
+  if(val==="0"){
+    delete edMelody[edSelected].d;
+  }else{
+    edMelody[edSelected].d=parseFloat(edDurNameToSec(val).toFixed(4));
+  }
+  edDraw();
+  edUpdateNotePanel();
+}
+
+// Set lane from note panel dropdown
+function edSetLane(val){
+  if(edSelected<0)return;
+  edMelody[edSelected].l=parseInt(val);
+  edDraw();
+  edUpdateNotePanel();
+}
+
 function getEdCanvas(){return document.getElementById("ed-canvas");}
 function getEdCtx(){return getEdCanvas().getContext("2d");}
 function edPxPerUnit(){return parseInt(document.getElementById("ed-zoom").value);}
@@ -5235,6 +5374,7 @@ function edDraw(){
     statusTxt+=" | Click=add, Shift+drag=select range";
   }
   document.getElementById("ed-status").textContent=statusTxt;
+  edUpdateNotePanel();
 }
 
 function edHitTest(x,y){
@@ -5733,8 +5873,14 @@ function edReset(){
   edSelected=-1;edDraw();
 }
 function edExport(){
-  var exportMelody=edMelody.map(function(m){var n={t:m.t,l:m.l};if(m.d>0)n.d=m.d;return n;});
+  var laneNames=["Red","Yellow","Blue","Green","Kick"];
-  var data=JSON.stringify({name:edPiece.n,bpm:edBpm,type:edIsClassical?"classical":"pattern",melody:exportMelody},null,2);
+  var exportMelody=edMelody.map(function(m){
+    var n={t:m.t,l:m.l,lane:laneNames[m.l]};
+    if(m.f){n.f=m.f;n.pitch=edFreqToNote(m.f);}
+    if(m.d>0){n.d=m.d;var di=edDurInfo(m.d);n.duration=di.name;}
+    return n;
+  });
+  var data=JSON.stringify({name:edPiece.n,bpm:edBpm,timeSig:edTimeSig[0]+"/"+edTimeSig[1],type:edIsClassical?"classical":"pattern",melody:exportMelody},null,2);
   navigator.clipboard.writeText(data).then(function(){
     document.getElementById("ed-status").textContent="Copied to clipboard!";
   }).catch(function(){
@@ -5764,26 +5910,38 @@ function edToggleCode(){
 }
 function edUpdateCode(){
   var ta=document.getElementById("ed-code");
+  var laneNames=["Red","Yel","Blu","Grn","Kick"];
   if(edIsClassical){
     var lines=edMelody.map(function(m){
       var s="  {t:"+m.t.toFixed(3)+", l:"+m.l;
+      if(m.f)s+=", f:"+m.f.toFixed(2);
       if(m.d>0)s+=", d:"+m.d.toFixed(3);
-      return s+"}";
+      s+="}";
+      // Human-readable comment
+      var comment=" // "+laneNames[m.l];
+      if(m.f)comment+=" "+edFreqToNote(m.f);
+      if(m.d>0){var di=edDurInfo(m.d);comment+=" "+di.sym+" "+di.name;}
+      return s+","+comment;
     });
     ta.value="// "+edPiece.n+" — melody ("+edMelody.length+" notes)\n"+
-      "// BPM: "+edBpm+", Duration: "+(edPiece.duration||"?")+"s\n"+
+      "// BPM: "+edBpm+", Time Sig: "+edTimeSig[0]+"/"+edTimeSig[1]+", Duration: "+(edPiece.duration||"?")+"s\n"+
-      "// Lanes: 0=Red 1=Yellow 2=Blue 3=Green 4=Kick | d=duration(s)\n"+
+      "// Lanes: 0=Red 1=Yellow 2=Blue 3=Green 4=Kick\n"+
-      "melody: [\n"+lines.join(",\n")+"\n]";
+      "// f=frequency(Hz) → pitch name, d=duration(s) → note value\n"+
+      "// Pitch: edit f values or use note names in Apply Code (e.g. f:\"C4\" → converted)\n"+
+      "melody: [\n"+lines.join("\n")+"\n]";
   }else{
     var lines2=edMelody.map(function(m){
       var s="  {t:"+m.t+", l:"+m.l;
       if(m.d>0)s+=", d:"+m.d;
-      return s+"}";
+      s+="}";
+      var comment=" // "+laneNames[m.l];
+      if(m.d>0){var di=edDurInfo(m.d);comment+=" "+di.sym+" "+di.name;}
+      return s+","+comment;
     });
     ta.value="// "+edPiece.n+" — pattern ("+edMelody.length+" notes, repeats "+edBars+"x)\n"+
       "// BPM: "+edBpm+", Bars: "+edBars+"\n"+
       "// t = beat offset (0-4), Lanes: 0=Red 1=Yellow 2=Blue 3=Green 4=Kick | d=duration\n"+
-      "p: [\n"+lines2.join(",\n")+"\n]";
+      "p: [\n"+lines2.join("\n")+"\n]";
   }
 }
 function edApplyCode(){
@@ -5797,7 +5955,18 @@ function edApplyCode(){
     var arrStr="["+match[1].replace(/(\w+)\s*:/g,'"$1":')+"]";
     var arr=JSON.parse(arrStr);
     edMelody=arr.filter(function(m){return typeof m.t==="number"&&typeof m.l==="number";})
-      .map(function(m){var n={t:m.t,l:m.l};if(m.d>0)n.d=m.d;return n;});
+      .map(function(m){
+        var n={t:m.t,l:m.l};
+        if(m.d>0)n.d=m.d;
+        // Handle f as number (Hz) or string (note name like "C4")
+        if(typeof m.f==="string"){
+          var freq=edNoteToFreq(m.f);
+          if(freq>0)n.f=freq;
+        }else if(typeof m.f==="number"&&m.f>0){
+          n.f=m.f;
+        }
+        return n;
+      });
     edMelody.sort(function(a,b){return a.t-b.t;});
     edSelected=-1;edDraw();
     document.getElementById("ed-status").textContent="Applied! "+edMelody.length+" notes loaded from code.";
@@ -5821,7 +5990,15 @@ function edDoImport(){
     var arr=Array.isArray(data)?data:(data.melody||data.p||[]);
     if(!Array.isArray(arr)||arr.length===0){document.getElementById("ed-import-status").textContent="No notes found";return;}
     edMelody=arr.filter(function(m){return typeof m.t==="number"&&typeof m.l==="number";})
-      .map(function(m){var n={t:m.t,l:m.l};if(m.d>0)n.d=m.d;return n;});
+      .map(function(m){
+        var n={t:m.t,l:m.l};
+        if(m.d>0)n.d=m.d;
+        // Handle pitch as note name string or "pitch" field from export
+        if(typeof m.f==="number"&&m.f>0){n.f=m.f;}
+        else if(typeof m.f==="string"){var freq=edNoteToFreq(m.f);if(freq>0)n.f=freq;}
+        else if(typeof m.pitch==="string"){var freq2=edNoteToFreq(m.pitch);if(freq2>0)n.f=freq2;}
+        return n;
+      });
     edMelody.sort(function(a,b){return a.t-b.t;});
     if(data.bpm)edBpm=data.bpm;
     document.getElementById("ed-bpm").value=edBpm;