feat(mq_editor): UI revamp — params panel, layout, partial spectrum

- Move Synthesis controls (integratePhase, jitter, spread, resonator,
  LP/HP filters) and Auto Spread All into the ⚙ Params dropdown
- Group Extract Partials / +Partial / ✕ Clear All in one toolbar group
- Add per-partial Sine/Res mode toggle in the property panel (Mode row)
- Move partial mini-spectrum below the right panel (right-col layout)
- Partial mini-spectrum: dynamic dB range scanned across full duration
  (8 samples, [peak−60, peak]), cached on partial select
- Print bezier amplitude A= in red at top-right of partial spectrum
- Status/info messages set to 80% gray (#ccc)

handoff(Claude): UI revamp complete, TODO items implemented.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

5 files changed, 178 insertions, 85 deletions

diff --git a/tools/mq_editor/TODO.md b/tools/mq_editor/TODO.md
new file mode 100644
index 0000000..d85aa84
--- /dev/null
+++ b/tools/mq_editor/TODO.md
@@ -0,0 +1,17 @@
+# UI revamp
+
+- the Synthesis panel (Integrate Phase, etc, LP, MP) contains global parameters -> Should go under the top "Params" button
+
+- 'Auto Spread All' should go under the 'Params' button too. It's a global action.
+
+- group 'Extract Partials' button with '+Partial' and 'x Clear All' ones.
+
+- add a sine / resonator toggle per partial to toggle between sine-based synth and resonator. 'Resonator (all)' takes precedence.
+
+- the partial's mini-spectrum should go under the right panel, since it's related
+
+- the partial's mini-spectrum should have a fixed dB range ([-40dB,10dB]?) instead of a dynamic one, to see the impact of amplitude modulation per partial
+
+- the messages' color is too dark, make them 80% gray when appropriate
+
+- streamline the CSS and styling, if possible
diff --git a/tools/mq_editor/editor.js b/tools/mq_editor/editor.js
index 98c92e5..07312d5 100644
--- a/tools/mq_editor/editor.js
+++ b/tools/mq_editor/editor.js
@@ -86,6 +86,38 @@ class PartialEditor {
     muteBtn.textContent  = partial.muted ? 'Unmute' : 'Mute';
     muteBtn.style.color  = partial.muted ? '#fa4' : '';
 
+    // Mode toggle (quick sine/resonator switch, no tab required)
+    const modeToggle = document.getElementById('synthModeToggle');
+    if (modeToggle) {
+      modeToggle.innerHTML = '';
+      const isRes = !!(partial.resonator && partial.resonator.enabled);
+      const resDefaults = { r: 0.995, gainComp: 1.0 };
+      const btnS = document.createElement('button');
+      btnS.textContent = 'Sine';
+      btnS.className = 'tab-btn' + (isRes ? '' : ' active');
+      btnS.style.cssText = 'padding:2px 8px;font-size:11px;margin:0;';
+      const btnR = document.createElement('button');
+      btnR.textContent = 'Res';
+      btnR.className = 'tab-btn' + (isRes ? ' active' : '');
+      btnR.style.cssText = 'padding:2px 8px;font-size:11px;margin:0;';
+      btnS.onclick = () => {
+        if (!this.partials || !this.partials[index]) return;
+        if (!this.partials[index].resonator) this.partials[index].resonator = {...resDefaults};
+        this.partials[index].resonator.enabled = false;
+        this._updatePropPanel(index);
+        if (this.viewer) this.viewer.render();
+      };
+      btnR.onclick = () => {
+        if (!this.partials || !this.partials[index]) return;
+        if (!this.partials[index].resonator) this.partials[index].resonator = {...resDefaults};
+        this.partials[index].resonator.enabled = true;
+        this._updatePropPanel(index);
+        if (this.viewer) this.viewer.render();
+      };
+      modeToggle.appendChild(btnS);
+      modeToggle.appendChild(btnR);
+    }
+
     this._buildCurveGrid(this._freqGrid, partial, 'freqCurve', 'f', index);
     this._buildCurveGrid(this._ampGrid,  partial, 'freqCurve', 'a', index, 'a');
     this._buildSynthGrid(partial, index);
diff --git a/tools/mq_editor/index.html b/tools/mq_editor/index.html
index efbd73d..a03ab35 100644
--- a/tools/mq_editor/index.html
+++ b/tools/mq_editor/index.html
@@ -19,7 +19,8 @@
     <span class="toolbar-sep"></span>
     <span class="toolbar-group">
       <button id="extractBtn" disabled>Extract Partials</button>
-      <button id="autoSpreadAllBtn" disabled>Auto Spread All</button>
+      <button id="newPartialBtn" disabled>+ Partial</button>
+      <button id="clearAllBtn" disabled>✕ Clear All</button>
     </span>
     <span class="toolbar-sep"></span>
     <span class="toolbar-group">
@@ -28,11 +29,6 @@
     </span>
     <span class="toolbar-sep"></span>
     <span class="toolbar-group">
-      <button id="newPartialBtn" disabled>+ Partial</button>
-      <button id="clearAllBtn" disabled>✕ Clear All</button>
-    </span>
-    <span class="toolbar-sep"></span>
-    <span class="toolbar-group">
       <button id="exploreBtn" disabled>⊕ Explore</button>
       <button id="contourBtn" disabled>≋ Contour</button>
     </span>
@@ -71,6 +67,39 @@
           <label title="Minimum number of frames a tracked partial must span. Shorter partials are discarded after tracking.">Min Len</label>
           <input type="number" id="minLength" value="10" min="1" max="50" step="1" style="width:50px;">
         </div>
+        <div class="param-group param-synth">
+          <span class="group-label">Synthesis</span>
+          <label><input type="checkbox" id="integratePhase" checked> Integrate phase</label>
+          <label><input type="checkbox" id="disableJitter"> Disable jitter</label>
+          <label><input type="checkbox" id="disableSpread"> Disable spread</label>
+          <label title="Test mode: force resonator synthesis for all partials (ignores per-partial mode setting)"><input type="checkbox" id="forceResonator"> Resonator (all)</label>
+          <div id="globalResParams" style="display:none;">
+            <label title="Global pole radius r in (0,1). Applied to all partials in resonator mode.">
+              r (pole)
+              <input type="range" id="globalR" min="0.75" max="0.9999" step="0.0001" value="0.995">
+              <span id="globalRVal" class="slider-val">0.9950</span>
+            </label>
+            <label title="Global gain compensation applied to all partials in resonator mode.">
+              gain
+              <input type="range" id="globalGain" min="0.0" max="4.0" step="0.01" value="1.0">
+              <span id="globalGainVal" class="slider-val">1.00</span>
+            </label>
+            <label title="Override per-partial r/gain with global values during playback"><input type="checkbox" id="forceRGain"> force r/gain</label>
+          </div>
+          <label title="LP filter coefficient k1 in (0,1]. 1.0 = bypass.">
+            LP k1
+            <input type="range" id="lpK1" min="0.001" max="1.0" step="0.001" value="1.0">
+            <span id="lpK1Val" class="slider-val">bypass</span>
+          </label>
+          <label title="HP filter coefficient k2 in (0,1]. 1.0 = bypass.">
+            HP k2
+            <input type="range" id="hpK2" min="0.001" max="1.0" step="0.001" value="1.0">
+            <span id="hpK2Val" class="slider-val">bypass</span>
+          </label>
+          <div style="padding-top:4px;">
+            <button id="autoSpreadAllBtn" disabled style="width:100%;padding:4px 8px;font-size:12px;margin:0;">Auto Spread All</button>
+          </div>
+        </div>
       </div>
     </span>
   </div>
@@ -82,10 +111,6 @@
         <canvas id="cursorCanvas" width="1400" height="600"></canvas>
         <canvas id="playheadCanvas" width="1400" height="600"></canvas>
 
-        <!-- Partial spectrum viewer (bottom-right overlay, left of main spectrum) -->
-        <div id="partialSpectrumViewer">
-          <canvas id="partialSpectrumCanvas" width="200" height="100"></canvas>
-        </div>
         <!-- Mini spectrum viewer (bottom-right overlay) -->
         <div id="spectrumViewer">
           <canvas id="spectrumCanvas" width="400" height="100"></canvas>
@@ -109,75 +134,52 @@
       </div>
     </div>
 
-    <div class="right-panel">
-      <!-- Partial properties (visible when a partial is selected) -->
-      <div id="partialProps" style="display:none;">
-        <div class="panel-title">
-          <span id="propTitle">Partial #—</span>
-          <span id="propSwatch"></span>
-        </div>
-        <div class="prop-row">
-          <span class="prop-label">Peak</span>
-          <span id="propPeak">—</span>
-        </div>
-        <div class="prop-row">
-          <span class="prop-label">Time</span>
-          <span id="propTime">—</span>
+    <div class="right-col">
+      <div class="right-panel">
+        <!-- Partial properties (visible when a partial is selected) -->
+        <div id="partialProps" style="display:none;">
+          <div class="panel-title">
+            <span id="propTitle">Partial #—</span>
+            <span id="propSwatch"></span>
+          </div>
+          <div class="prop-row">
+            <span class="prop-label">Peak</span>
+            <span id="propPeak">—</span>
+          </div>
+          <div class="prop-row">
+            <span class="prop-label">Time</span>
+            <span id="propTime">—</span>
+          </div>
+          <div class="prop-row">
+            <span class="prop-label">Mode</span>
+            <span id="synthModeToggle" style="display:flex;gap:3px;"></span>
+          </div>
+          <div class="curve-tabs">
+            <button class="tab-btn active" data-tab="Freq">Freq</button>
+            <button class="tab-btn" data-tab="Amp">Amp</button>
+            <button class="tab-btn" data-tab="Synth">Synth</button>
+          </div>
+          <div class="tab-pane" id="tabFreq">
+            <div class="curve-grid" id="freqCurveGrid"></div>
+          </div>
+          <div class="tab-pane" id="tabAmp" style="display:none;">
+            <div class="curve-grid" id="ampCurveGrid"></div>
+          </div>
+          <div class="tab-pane" id="tabSynth" style="display:none;">
+            <div class="synth-grid" id="synthGrid"></div>
+          </div>
+          <div class="partial-actions">
+            <button id="mutePartialBtn">Mute</button>
+            <button id="deletePartialBtn">Delete <kbd>Del</kbd></button>
+          </div>
         </div>
-        <div class="curve-tabs">
-          <button class="tab-btn active" data-tab="Freq">Freq</button>
-          <button class="tab-btn" data-tab="Amp">Amp</button>
-          <button class="tab-btn" data-tab="Synth">Synth</button>
-        </div>
-        <div class="tab-pane" id="tabFreq">
-          <div class="curve-grid" id="freqCurveGrid"></div>
-        </div>
-        <div class="tab-pane" id="tabAmp" style="display:none;">
-          <div class="curve-grid" id="ampCurveGrid"></div>
-        </div>
-        <div class="tab-pane" id="tabSynth" style="display:none;">
-          <div class="synth-grid" id="synthGrid"></div>
-        </div>
-        <div class="partial-actions">
-          <button id="mutePartialBtn">Mute</button>
-          <button id="deletePartialBtn">Delete <kbd>Del</kbd></button>
-        </div>
-      </div>
 
-      <div id="noSelMsg">Click a partial to select</div>
+        <div id="noSelMsg">Click a partial to select</div>
+      </div>
 
-      <!-- Synthesis options (always at bottom) -->
-      <div class="synth-section">
-        <div class="panel-title">Synthesis</div>
-        <label><input type="checkbox" id="integratePhase" checked> Integrate phase</label>
-        <label><input type="checkbox" id="disableJitter"> Disable jitter</label>
-        <label><input type="checkbox" id="disableSpread"> Disable spread</label>
-        <label title="Test mode: force resonator synthesis for all partials (ignores per-partial mode setting)"><input type="checkbox" id="forceResonator"> Resonator (all)</label>
-        <div id="globalResParams" style="display:none;">
-          <label title="Global pole radius r in (0,1). Applied to all partials in resonator mode.">
-            r (pole)
-            <input type="range" id="globalR" min="0.75" max="0.9999" step="0.0001" value="0.995">
-            <span id="globalRVal" class="slider-val">0.9950</span>
-          </label>
-          <label title="Global gain compensation applied to all partials in resonator mode.">
-            gain
-            <input type="range" id="globalGain" min="0.0" max="4.0" step="0.01" value="1.0">
-            <span id="globalGainVal" class="slider-val">1.00</span>
-          </label>
-          <label title="Override per-partial r/gain with global values during playback"><input type="checkbox" id="forceRGain"> force r/gain</label>
-        </div>
-        <div style="margin-top:6px;">
-          <label title="LP filter coefficient k1 in (0,1]. 1.0 = bypass.">
-            LP k1
-            <input type="range" id="lpK1" min="0.001" max="1.0" step="0.001" value="1.0">
-            <span id="lpK1Val" class="slider-val">bypass</span>
-          </label>
-          <label title="HP filter coefficient k2 in (0,1]. 1.0 = bypass.">
-            HP k2
-            <input type="range" id="hpK2" min="0.001" max="1.0" step="0.001" value="1.0">
-            <span id="hpK2Val" class="slider-val">bypass</span>
-          </label>
-        </div>
+      <!-- Partial spectrum viewer (below right panel, since it's related) -->
+      <div id="partialSpectrumViewer">
+        <canvas id="partialSpectrumCanvas" width="258" height="100"></canvas>
       </div>
     </div>
   </div>
diff --git a/tools/mq_editor/style.css b/tools/mq_editor/style.css
index 07a404a..2a9b5b7 100644
--- a/tools/mq_editor/style.css
+++ b/tools/mq_editor/style.css
@@ -12,6 +12,7 @@ input[type="file"] { display: none; }
 .main-area { display: flex; align-items: flex-start; gap: 10px; margin-top: 10px; }
 .canvas-col { display: flex; flex-direction: column; gap: 6px; flex-shrink: 0; }
 .canvas-wrap { position: relative; }
+.right-col { display: flex; flex-direction: column; gap: 6px; }
 
 /* === Toolbar === */
 .toolbar { margin-bottom: 10px; padding: 10px; background: #2a2a2a; border-radius: 4px; display: flex; align-items: center; flex-wrap: wrap; gap: 4px; }
@@ -36,14 +37,25 @@ button.contour-active { background: #145; border-color: #0cc; color: #aff; }
 .param-group:last-child { border-bottom: none; }
 .group-label { grid-column: 1 / -1; font-size: 9px; color: #666; text-transform: uppercase; letter-spacing: 1px; }
 
+/* Synthesis param group (column layout) */
+.param-synth { display: block; padding: 8px 14px; border-bottom: 1px solid #333; }
+.param-synth:last-child { border-bottom: none; }
+.param-synth .group-label { display: block; margin-bottom: 4px; }
+.param-synth label { display: flex; align-items: center; gap: 6px; font-size: 12px; margin: 2px 0; cursor: pointer; white-space: nowrap; }
+.param-synth label input[type="range"] { flex: 1; min-width: 80px; max-width: 120px; }
+.param-synth #globalResParams { margin-top: 4px; padding: 4px 0 2px 12px; border-left: 2px solid #555; }
+
 /* === Canvas & overlays === */
 #canvas { border: 1px solid #555; background: #000; cursor: crosshair; display: block; flex-shrink: 0; }
 #cursorCanvas, #playheadCanvas { position: absolute; top: 0; left: 0; pointer-events: none; }
-#partialSpectrumViewer { position: absolute; bottom: 10px; right: 420px; width: 200px; height: 100px; background: rgba(30,30,30,.9); border: 1px solid #555; border-radius: 3px; pointer-events: none; }
 #spectrumViewer { position: absolute; bottom: 10px; right: 10px; width: 400px; height: 100px; background: rgba(30,30,30,.9); border: 1px solid #555; border-radius: 3px; pointer-events: none; }
 #keepOverlay { position: absolute; bottom: 10px; left: 10px; background: rgba(30,30,30,.88); border: 1px solid #555; border-radius: 3px; padding: 4px 8px; display: flex; align-items: center; gap: 6px; font-size: 12px; color: #aaa; user-select: none; }
 #keepOverlay input[type="range"] { width: 90px; }
 
+/* Partial spectrum (below right panel) */
+#partialSpectrumViewer { width: 260px; box-sizing: border-box; background: rgba(30,30,30,.9); border: 1px solid #555; border-radius: 3px; overflow: hidden; }
+#partialSpectrumCanvas { display: block; }
+
 /* === Amp edit panel === */
 #ampEditPanel { display: none; }
 .amp-edit-header { font-size: 10px; color: #555; padding: 2px 0 3px 1px; display: flex; align-items: center; gap: 10px; text-transform: uppercase; letter-spacing: .5px; }
@@ -59,7 +71,7 @@ button.contour-active { background: #145; border-color: #0cc; color: #aff; }
 #noSelMsg { color: #555; font-size: 13px; padding: 2px 0; }
 
 /* === Partial properties === */
-.prop-row { display: flex; justify-content: space-between; align-items: baseline; font-size: 13px; padding: 2px 0; }
+.prop-row { display: flex; justify-content: space-between; align-items: center; font-size: 13px; padding: 2px 0; }
 .prop-label { color: #777; font-size: 12px; }
 #propSwatch { display: inline-block; width: 10px; height: 10px; border-radius: 2px; flex-shrink: 0; }
 .partial-actions { display: flex; gap: 4px; margin-top: 8px; }
@@ -78,12 +90,10 @@ kbd { font-size: 10px; opacity: 0.55; }
 .synth-field-wrap input[type="number"]:focus,
 .synth-grid input[type="number"]:focus { border-color: #666; outline: none; }
 
-/* === Synth section === */
-.synth-section { border-top: 1px solid #444; padding-top: 8px; margin-top: auto; }
+/* === Synth grid (per-partial synth tab) === */
 .synth-grid { display: grid; grid-template-columns: auto 1fr; gap: 4px 8px; align-items: center; }
 .synth-grid span { color: #888; font-size: 12px; }
 .synth-field-wrap { display: flex; align-items: center; gap: 4px; }
-#globalResParams { margin-top: 4px; padding: 4px 0 2px 12px; border-left: 2px solid #555; }
 .slider-val { width: 44px; text-align: right; }
 
 /* === Jog slider === */
@@ -97,8 +107,8 @@ kbd { font-size: 10px; opacity: 0.55; }
 
 /* === Status & tooltip === */
 #fileLabel { font-size: 13px; color: #8af; opacity: .8; }
-#status { margin-top: 10px; padding: 8px; background: #2a2a2a; border-radius: 4px; min-height: 20px; }
-.info { color: #4af; }
+#status { margin-top: 10px; padding: 8px; background: #2a2a2a; border-radius: 4px; min-height: 20px; color: #ccc; }
+.info { color: #ccc; }
 .warn { color: #fa4; }
 .error { color: #f44; }
 #tooltip { position: fixed; display: none; background: #2a2a2a; padding: 4px 8px; border: 1px solid #555; border-radius: 3px; pointer-events: none; font-size: 11px; z-index: 1000; }
diff --git a/tools/mq_editor/viewer.js b/tools/mq_editor/viewer.js
index 4744b96..1ac1afd 100644
--- a/tools/mq_editor/viewer.js
+++ b/tools/mq_editor/viewer.js
@@ -54,6 +54,7 @@ class SpectrogramViewer {
     this.partialSpectrumCanvas = document.getElementById('partialSpectrumCanvas');
     this.partialSpectrumCtx = this.partialSpectrumCanvas ? this.partialSpectrumCanvas.getContext('2d') : null;
     this._partialSpecCache = null; // {partialIndex, time, specData?} — see renderPartialSpectrum
+    this._partialRangeCache = null; // {partialIndex, dbMin, dbMax} — scanned across full partial duration
     this.synthOpts = {}; // synth options forwarded to synthesizeMQ (forceResonator, etc.)
     this.onGetSynthOpts = null; // callback() → opts; called before each spectrum compute
 
@@ -179,6 +180,7 @@ class SpectrogramViewer {
 
   selectPartial(index) {
     this._partialSpecCache = null;
+    this._partialRangeCache = null;
     this.selectedPartial = index;
     this.render();
     if (this.onPartialSelect) this.onPartialSelect(index);
@@ -691,7 +693,13 @@ class SpectrogramViewer {
     const specData = this._computePartialSpectrum(partial, specTime);
     this._partialSpecCache = {partialIndex: p, time: specTime, specData};
 
-    const {squaredAmp, maxDB, sampleRate, fftSize} = specData;
+    // dB range: scanned across full partial duration, cached per partial
+    if (!this._partialRangeCache || this._partialRangeCache.partialIndex !== p) {
+      this._partialRangeCache = this._computePartialRange(p, partial);
+    }
+    const {dbMin: DB_MIN, dbMax: DB_MAX} = this._partialRangeCache;
+
+    const {squaredAmp, sampleRate, fftSize} = specData;
     const numBins  = fftSize / 2;
     const binWidth = sampleRate / fftSize;
     const color    = this.partialColor(p);
@@ -710,7 +718,7 @@ class SpectrogramViewer {
       for (let b = bStart; b <= bEnd; ++b) if (squaredAmp[b] > maxSq) maxSq = squaredAmp[b];
 
       const magDB = 10 * Math.log10(Math.max(maxSq, 1e-20));
-      const barH  = Math.round(this.normalizeDB(magDB, maxDB) * (height - 12));
+      const barH  = Math.round(Math.max(0, Math.min(1, (magDB - DB_MIN) / (DB_MAX - DB_MIN))) * (height - 12));
       if (barH <= 0) continue;
 
       const grad = ctx.createLinearGradient(0, height - barH, 0, height);
@@ -722,6 +730,12 @@ class SpectrogramViewer {
 
     ctx.fillStyle = color;
     ctx.fillText('P#' + p + ' @' + specTime.toFixed(3) + 's', 4, 10);
+
+    const amp = evalBezierAmp(curve, specTime);
+    ctx.fillStyle = '#f44';
+    ctx.textAlign = 'right';
+    ctx.fillText('A=' + amp.toFixed(3), width - 3, 10);
+    ctx.textAlign = 'left';
   }
 
   // Synthesise a 2048-sample Hann-windowed frame of `partial` centred on `time`, run FFT,
@@ -773,6 +787,24 @@ class SpectrogramViewer {
     return {squaredAmp, maxDB, sampleRate, fftSize: FFT_SIZE};
   }
 
+  // Scan the partial across its full duration to find the peak dB level, then derive
+  // [dbMin, dbMax] as [peak − 60, peak].  Cached per partialIndex; only called once on select.
+  _computePartialRange(partialIndex, partial) {
+    const fc = partial.freqCurve;
+    if (!fc) return {partialIndex, dbMin: -60, dbMax: 0};
+    const N = 8;
+    let globalMaxSq = 1e-20;
+    for (let i = 0; i < N; ++i) {
+      const t = fc.t0 + (fc.t3 - fc.t0) * (i + 0.5) / N;
+      const {squaredAmp} = this._computePartialSpectrum(partial, t);
+      for (let b = 0; b < squaredAmp.length; ++b) {
+        if (squaredAmp[b] > globalMaxSq) globalMaxSq = squaredAmp[b];
+      }
+    }
+    const dbMax = 10 * Math.log10(globalMaxSq);
+    return {partialIndex, dbMin: dbMax - 60, dbMax};
+  }
+
   // --- View management ---
 
   updateViewBounds() {