diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
index f2fd376..5862930 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
@@ -2719,19 +2719,17 @@ if (spectrumCanvas) {
   spectrumCanvas.addEventListener("wheel", (e) => {
     e.preventDefault();
     if (!lastSpectrumData) return;
+    if (e.ctrlKey) {
+      const direction = e.deltaY < 0 ? 1 : -1;
+      jogFreq(direction);
+      return;
+    }
     const rect   = spectrumCanvas.getBoundingClientRect();
     const cssX   = e.clientX - rect.left;
     const factor = e.deltaY < 0 ? 1.25 : 1 / 1.25;
     spectrumZoomAt(cssX, rect.width, lastSpectrumData, factor);
     drawSpectrum(lastSpectrumData);
   }, { passive: false });
-
-  // Double-click → reset zoom/pan
-  spectrumCanvas.addEventListener("dblclick", () => {
-    spectrumZoom    = 1;
-    spectrumPanFrac = 0.5;
-    if (lastSpectrumData) drawSpectrum(lastSpectrumData);
-  });
 }
 
 // ── BW strip edge hit-test (CSS pixels) ──────────────────────────────────────
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html
index 69b0e62..bd01ea4 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html
@@ -71,7 +71,7 @@
           <button id="spectrum-auto-btn" type="button">Auto</button>
         </div>
       </div>
-      <div id="spectrum-hint">Scroll to zoom &middot; Drag to pan &middot; Double-click to reset &middot; Drag BW edges to resize</div>
+      <div id="spectrum-hint">Scroll to zoom &middot; Ctrl+Scroll to tune &middot; Drag to pan &middot; Drag BW edges to resize</div>
     </div>
     <div class="status">
       <div class="full-row freq-row">
@@ -84,7 +84,7 @@
             <input class="status-input" id="freq" type="text" value="--" />
             <div class="label"><span>Frequency</span></div>
           </div>
-          <div class="freq-field frequency-col" id="center-freq-field" style="display:none;">
+          <div class="freq-field frequency-col center-frequency-col" id="center-freq-field" style="display:none;">
             <input class="status-input" id="center-freq" type="text" value="--" />
             <div class="label"><span>Central Frequency</span></div>
           </div>