diff --git a/client/public/changelog.md b/client/public/changelog.md
index 4537993..d7de982 100644
--- a/client/public/changelog.md
+++ b/client/public/changelog.md
@@ -2,8 +2,13 @@
 
 > This document records feature updates and bug fixes for the Luxsin X8 controller. A new entry is appended here after each release.
 
-## 2026.08.06
+## v2026.08.06
 
 ### New Features
 - Added a "What's New" entry on the home page, allowing you to view release notes online.
 - Added Undo support on the EQ page: tap the Undo button to revert your most recent change. It covers band parameter edits (frequency / gain / Q / filter type), slider drag adjustments, preamp and auto-preamp changes, A/B mode copy & switch, and batch edits. Each undo shows a toast describing exactly what was reverted (e.g. "A Band 3 GAIN +2.0 → 0.0").
+
+## v2026.08.12
+
+### Bug Fixes
+- Effects → Loudness: fixed the threshold slider minimum incorrectly stopping at -30 dB; it now correctly goes down to -40 dB.
diff --git a/client/src/pages/EQPage.tsx b/client/src/pages/EQPage.tsx
index 40b2b43..af83310 100644
--- a/client/src/pages/EQPage.tsx
+++ b/client/src/pages/EQPage.tsx
@@ -44,7 +44,6 @@ import { ShareDialog } from "./eq/components/ShareDialog";
 import { BrandDrawer } from "./eq/components/BrandDrawer";
 import { PeqOverwriteConfirmDialog } from "./eq/components/PeqOverwriteConfirmDialog";
 import { PeqPresetManageDialog } from "./eq/components/PeqPresetManageDialog";
-import { PeqUndoButton } from "./eq/components/PeqUndoButton";
 import { useRawCurve } from "./eq/hooks/useRawCurve";
 import {
   usePeqUndoHistory,
@@ -1607,11 +1606,6 @@ export default function EQPage() {
             )}
           </div>
           <div className="flex shrink-0 items-center gap-2">
-            <PeqUndoButton
-              disabled={!canUndo}
-              label={eqUi.undo ?? "Undo"}
-              onClick={handleUndo}
-            />
             <button
               className="w-9 h-9 rounded-full flex items-center justify-center text-white/60 active:text-white transition-colors"
               style={{ background: "rgba(44,44,46,0.8)", border: "1px solid rgba(255,255,255,0.1)" }}
@@ -1647,6 +1641,8 @@ export default function EQPage() {
           abMode={abMode}
           onAbToggle={handleAbToggle}
           onCopyAndSwitchTo={handleCopyAndSwitchTo}
+          canUndo={canUndo}
+          onUndo={handleUndo}
           onApplyB={() => void handleApplyB()}
           onSaveB={openSaveBDialog}
           onBandDrag={(idx, patch) => setBands((prev) => prev.map((b, i) => i === idx ? { ...b, ...patch } : b))}
diff --git a/client/src/pages/EffectsPage.tsx b/client/src/pages/EffectsPage.tsx
index 7a36e45..176f386 100644
--- a/client/src/pages/EffectsPage.tsx
+++ b/client/src/pages/EffectsPage.tsx
@@ -379,7 +379,7 @@ export default function EffectsPage() {
                 </div>
                 <CyanSlider
                   value={localLoudnessThreshold}
-                  min={-30}
+                  min={-40}
                   max={0}
                   step={1}
                   onChange={(v) => {
diff --git a/client/src/pages/eq/components/FreqChart.tsx b/client/src/pages/eq/components/FreqChart.tsx
index e7de50c..9790029 100644
--- a/client/src/pages/eq/components/FreqChart.tsx
+++ b/client/src/pages/eq/components/FreqChart.tsx
@@ -4,6 +4,7 @@ import { useStrokeDrawAnimation } from "@/lib/useStrokeDrawAnimation";
 import { buildPeqSvgCurveData, sampleCombinedPeqMagnitudeDb } from "@/lib/peqAudio";
 import { eqInterp } from "../eqFormatters";
 import type { EqBand, PeqEqUi } from "../types";
+import { PeqUndoButton } from "./PeqUndoButton";
 
 function LegendCurveIndicator({
   loading,
@@ -32,6 +33,8 @@ export type FreqChartProps = {
   abMode: "A" | "B";
   onAbToggle: (m: "A" | "B") => void;
   onCopyAndSwitchTo: (to: "A" | "B") => void;
+  canUndo: boolean;
+  onUndo: () => void;
   onApplyB: () => void;
   onSaveB: () => void;
   onBandDrag: (idx: number, patch: Partial<{ freq: number; gain: number }>) => void;
@@ -49,6 +52,8 @@ export function FreqChart({
   abMode,
   onAbToggle,
   onCopyAndSwitchTo,
+  canUndo,
+  onUndo,
   onApplyB,
   onSaveB,
   onBandDrag,
@@ -307,6 +312,11 @@ export function FreqChart({
           >
             {copyButtonText}
           </button>
+          <PeqUndoButton
+            disabled={!canUndo}
+            label={eqUi.undo ?? "Undo"}
+            onClick={onUndo}
+          />
         </div>
         <div className="ml-auto flex shrink-0 items-center gap-2">
           <button
diff --git a/client/src/pages/eq/components/PeqUndoButton.tsx b/client/src/pages/eq/components/PeqUndoButton.tsx
index 23294b7..64b7f43 100644
--- a/client/src/pages/eq/components/PeqUndoButton.tsx
+++ b/client/src/pages/eq/components/PeqUndoButton.tsx
@@ -1,4 +1,3 @@
-import { Undo2 } from "lucide-react";
 import { cn } from "@/lib/utils";
 
 type PeqUndoButtonProps = {
@@ -8,6 +7,11 @@ type PeqUndoButtonProps = {
   className?: string;
 };
 
+const pillStyle = {
+  background: "rgba(44,44,46,0.7)",
+  border: "1px solid rgba(255,255,255,0.08)",
+} as const;
+
 /**
  * EQ page undo control — disabled when the undo stack is empty.
  */
@@ -25,22 +29,15 @@ export function PeqUndoButton({
       title={label}
       onClick={onClick}
       className={cn(
-        "w-9 h-9 rounded-full flex items-center justify-center transition-colors active:scale-95",
+        "px-3 py-1 rounded-[8px] text-[11px] transition-colors",
         disabled
-          ? "text-white/25 cursor-not-allowed"
-          : "text-white/70 active:text-white",
+          ? "text-white/25 cursor-not-allowed opacity-50"
+          : "text-white/50 active:text-white",
         className,
       )}
-      style={{
-        background: disabled
-          ? "rgba(44,44,46,0.45)"
-          : "rgba(44,44,46,0.8)",
-        border: disabled
-          ? "1px solid rgba(255,255,255,0.06)"
-          : "1px solid rgba(255,255,255,0.1)",
-      }}
+      style={pillStyle}
     >
-      <Undo2 size={18} />
+      {label}
     </button>
   );
 }