diff --git a/src/components/VideoEditor.tsx b/src/components/VideoEditor.tsx
index 3ffb6a67..60497607 100644
--- a/src/components/VideoEditor.tsx
+++ b/src/components/VideoEditor.tsx
@@ -355,7 +355,7 @@ export default function VideoEditor() {
               aria-label='Export video'
               aria-disabled={!file || isProcessing ? "true" : undefined}
               className={cn(
-                "w-full flex items-center justify-center gap-3 py-5 rounded-xl",
+                "w-full flex items-center justify-center gap-3 py-5 min-h-[44px] rounded-xl",
                 "font-display text-2xl tracking-widest transition-all duration-200",
                 file && !isProcessing
                   ? "bg-film-600 hover:bg-film-700 hover:scale-[1.01] text-white shadow-lg shadow-film-200 active:scale-[0.98] cursor-pointer"
diff --git a/src/lib/tests/ffmpeg.test.ts b/src/lib/tests/ffmpeg.test.ts
index bdde5d41..c2e42e74 100644
--- a/src/lib/tests/ffmpeg.test.ts
+++ b/src/lib/tests/ffmpeg.test.ts
@@ -3,15 +3,15 @@ import { buildAudioFilter } from "../ffmpeg";
 
 describe("buildAudioFilter", () => {
   it("should return an empty string for 1.0x speed", () => {
-    expect(buildAudioFilter(1)).toBe("");
+    expect(buildAudioFilter(1, false)).toBe("");
   });
 
   it("should chain two 0.5x filters for 0.25x speed", () => {
-    expect(buildAudioFilter(0.25)).toBe("atempo=0.5,atempo=0.5");
+    expect(buildAudioFilter(0.25, false)).toBe("atempo=0.5,atempo=0.5");
   });
 
   it("should chain two 2.0x filters for 4.0x speed", () => {
-    expect(buildAudioFilter(4)).toBe("atempo=2.0,atempo=2");
+    expect(buildAudioFilter(4, false)).toBe("atempo=2.0,atempo=2");
   });
 
   it("should chain multiple 0.5x filters and a remainder for 0.1x speed", () => {
@@ -19,25 +19,30 @@ describe("buildAudioFilter", () => {
     // 0.2 / 0.5 = 0.4
     // 0.4 / 0.5 = 0.8
     // Result should be three 0.5s and one 0.8
-    expect(buildAudioFilter(0.1)).toBe("atempo=0.5,atempo=0.5,atempo=0.5,atempo=0.8");
+    expect(buildAudioFilter(0.1, false)).toBe("atempo=0.5,atempo=0.5,atempo=0.5,atempo=0.8");
   });
 
   it("should chain multiple 2.0x filters and a remainder for 3.0x speed", () => {
     // 3.0 / 2.0 = 1.5
-    expect(buildAudioFilter(3)).toBe("atempo=2.0,atempo=1.5");
+    expect(buildAudioFilter(3, false)).toBe("atempo=2.0,atempo=1.5");
   });
 
   it("should handle boundary values inside the 0.5x-2.0x range without chaining", () => {
-    expect(buildAudioFilter(0.5)).toBe("atempo=0.5");
-    expect(buildAudioFilter(2.0)).toBe("atempo=2"); // Note: Number(2.0.toFixed(4)) -> 2
-    expect(buildAudioFilter(1.5)).toBe("atempo=1.5");
-    expect(buildAudioFilter(0.75)).toBe("atempo=0.75");
+    expect(buildAudioFilter(0.5, false)).toBe("atempo=0.5");
+    expect(buildAudioFilter(2.0, false)).toBe("atempo=2"); // Note: Number(2.0.toFixed(4)) -> 2
+    expect(buildAudioFilter(1.5, false)).toBe("atempo=1.5");
+    expect(buildAudioFilter(0.75, false)).toBe("atempo=0.75");
   });
 
   it("should chain properly for very large speeds", () => {
     // 10 / 2.0 = 5
     // 5 / 2.0 = 2.5
     // 2.5 / 2.0 = 1.25
-    expect(buildAudioFilter(10)).toBe("atempo=2.0,atempo=2.0,atempo=2.0,atempo=1.25");
+    expect(buildAudioFilter(10, false)).toBe("atempo=2.0,atempo=2.0,atempo=2.0,atempo=1.25");
+  });
+
+  it("should append loudnorm filter when normalizeAudio is true", () => {
+    const result = buildAudioFilter(1, true);
+    expect(result).toContain("loudnorm");
   });
 });