diff --git a/app/api/v1/plugins.py b/app/api/v1/plugins.py
index 144734c..638f8cd 100644
--- a/app/api/v1/plugins.py
+++ b/app/api/v1/plugins.py
@@ -616,6 +616,8 @@ class RenderRequest(BaseModel):
     normalize: Optional[bool] = False
     normalize_target: Optional[str] = "-1dbtp"
     mono_check: Optional[bool] = False
+    # Gap 13: BWF/INFO metadata (title/artist/isrc/comment/description/...)
+    metadata: Optional[dict] = None
 
 
 class FxGuiRequest(BaseModel):
@@ -1212,6 +1214,7 @@ def render_project(
             dither=bool(req.dither),
             normalize=bool(req.normalize),
             normalize_target=req.normalize_target or "-1dbtp",
+            metadata=req.metadata or None,
         )
         # EBU R128 loudness + true peak (D1) — trả kèm response để mastering
         # panel hiển thị LUFS/dBTP ngay sau export mà không cần đọc lại file.
diff --git a/app/api/v1/projects.py b/app/api/v1/projects.py
index c5c8290..28c33c4 100644
--- a/app/api/v1/projects.py
+++ b/app/api/v1/projects.py
@@ -546,6 +546,7 @@ async def cleanup_all_backups(req: CleanupBackupsRequest, current_user: dict = D
 
 class RenderProjectRequest(BaseModel):
     sample_rate: Optional[int] = 44100
+    metadata: Optional[dict] = None  # Gap 13: BWF/INFO metadata (title/artist/isrc/...)
 
 @router.post("/cloud/{project_id}/render")
 async def render_project_endpoint(project_id: str, req: RenderProjectRequest, current_user: dict = Depends(get_current_user)):
@@ -568,7 +569,8 @@ async def render_project_endpoint(project_id: str, req: RenderProjectRequest, cu
         project_id=project_id,
         project_name=row["name"],
         project_json_str=row["data_json"],
-        sample_rate=req.sample_rate or 44100
+        sample_rate=req.sample_rate or 44100,
+        metadata=req.metadata or None
     )
     
     return {
diff --git a/app/core/render_engine.py b/app/core/render_engine.py
index a4eb9c1..294ac53 100644
--- a/app/core/render_engine.py
+++ b/app/core/render_engine.py
@@ -839,7 +839,9 @@ class PythonRenderEngine:
     def render_project(self, project_json: dict, output_filepath: str,
                        bit_depth: int = 32, out_sample_rate: int = 0,
                        dither: bool = False, normalize: bool = False,
-                       normalize_target: str = "-1dbtp"):
+                       normalize_target: str = "-1dbtp",
+                       metadata: dict = None):
+        # Gap 13: BWF/INFO metadata — tham số phụ, không đổi hành vi cũ khi None.
         with RENDER_LOCK:
             bpm = project_json["metadata"]["bpm"]
             time_sig_num = project_json["metadata"].get("time_signature_numerator", 4)
@@ -963,4 +965,12 @@ class PythonRenderEngine:
                          out_sr, subtype="PCM_24")
             else:
                 sf.write(output_filepath, master_buffer.T, out_sr, subtype="FLOAT")
+            # Gap 13: BWF/INFO chunks (bext + LIST/INFO title/artist/ISRC) —
+            # chen sau khi ghi PCM, loi metadata khong lam hong file audio.
+            if metadata:
+                try:
+                    from app.core.wav_bwf import patch_bwf_metadata
+                    patch_bwf_metadata(output_filepath, metadata)
+                except Exception as e:
+                    logger.warning("[RenderEngine] BWF metadata skipped: %s", e)
             return output_filepath
diff --git a/app/core/wav_bwf.py b/app/core/wav_bwf.py
new file mode 100644
index 0000000..1107133
--- /dev/null
+++ b/app/core/wav_bwf.py
@@ -0,0 +1,88 @@
+"""Gap 13: BWF/INFO metadata chunks cho WAV export (EBU Tech 3285 + RIFF INFO).
+
+sf.write chi ghi fmt/data — ham nay chen bext (602 bytes fixed + coding history)
+va LIST/INFO (INAM title, IART artist, ISRC, ICMT comment) ngay truoc data chunk
+roi ghi lai file. Pure stdlib (struct/datetime).
+"""
+import datetime
+import struct
+
+_BEXT_FIXED = 602
+
+
+def _pad(text, length):
+    raw = text.encode("utf-8", errors="replace")
+    return (raw[:length] + b"\x00" * length)[:length]
+
+
+def _chunk(fourcc, payload):
+    pad = b"\x00" if len(payload) % 2 else b""
+    return fourcc + struct.pack("<I", len(payload)) + payload + pad
+
+
+def _info_sub(fourcc, text):
+    if not text:
+        return b""
+    return _chunk(fourcc, _pad(text, len(text.encode("utf-8", errors="replace")) + 1))
+
+
+def _bext(md, now):
+    fixed = bytearray(_BEXT_FIXED)
+    fixed[0:256] = _pad(md.get("description", ""), 256)
+    fixed[256:288] = _pad(md.get("originator", "SonicForgeStudio"), 32)
+    fixed[288:320] = _pad(md.get("originator_reference", ""), 32)
+    fixed[320:330] = _pad((md.get("date") or now.strftime("%Y-%m-%d")), 10)
+    fixed[330:338] = _pad((md.get("time") or now.strftime("%H:%M:%S")), 8)
+    struct.pack_into("<II", fixed, 338, 0, 0)          # time reference low/high
+    struct.pack_into("<H", fixed, 346, 1)              # version = 1
+    fixed[348:412] = bytes(64)                         # UMID (zero)
+    struct.pack_into("<hhhhh", fixed, 412, -32768, -32768, -32768, -32768, -32768)  # loudness: 0x8000 = unset
+    fixed[422:602] = bytes(180)                        # reserved
+    coding = md.get("coding_history", "").encode("utf-8", errors="replace")
+    return bytes(fixed) + coding
+
+
+def patch_bwf_metadata(path, metadata=None):
+    """Chen bext + LIST/INFO vao WAV tai path (rewrite in-place, giu nguyen PCM bits).
+
+    metadata keys: title, artist, isrc, comment, description, originator,
+    originator_reference, date (YYYY-MM-DD), time (HH:MM:SS), coding_history.
+    Bo qua neu file khong phai RIFF/WAVE hop le hoac metadata rong.
+    """
+    if not metadata:
+        return
+    md = {k: (v or "").strip() for k, v in metadata.items() if v}
+    if not md:
+        return
+    with open(path, "rb") as f:
+        data = f.read()
+    if len(data) < 12 or data[:4] != b"RIFF" or data[8:12] != b"WAVE":
+        return
+
+    off = 12
+    pre = b""
+    data_chunk = None
+    while off + 8 <= len(data):
+        cid = data[off:off + 4]
+        size = struct.unpack("<I", data[off + 4:off + 8])[0]
+        body = data[off + 8:off + 8 + size]
+        if cid == b"data":
+            data_chunk = (cid, size, body)
+            break
+        pre += _chunk(cid, body)
+        off += 8 + size + (size % 2)
+    if data_chunk is None:
+        return
+
+    now = datetime.datetime.now()
+    info_payload = b"INFO" + b"".join([
+        _info_sub(b"INAM", md.get("title", "")),
+        _info_sub(b"IART", md.get("artist", "")),
+        _info_sub(b"ISRC", md.get("isrc", "")),
+        _info_sub(b"ICMT", md.get("comment", "")),
+    ])
+    extra = _chunk(b"bext", _bext(md, now)) + _chunk(b"LIST", info_payload)
+    new_data = data[:12] + pre + extra + _chunk(data_chunk[0], data_chunk[2])
+    new_data = new_data[:4] + struct.pack("<I", len(new_data) - 8) + new_data[8:]
+    with open(path, "wb") as f:
+        f.write(new_data)
diff --git a/app/static/js/app.jsx b/app/static/js/app.jsx
index e0b353d..051c87e 100644
--- a/app/static/js/app.jsx
+++ b/app/static/js/app.jsx
@@ -12361,6 +12361,26 @@ const ExportModal = ({ open, onClose, exportSettings, setExportSettings, isExpor
               </label>
             )}
           </div>
+          <div className="grid grid-cols-3 gap-2 pt-1 bg-[#141414] border border-zinc-800 rounded px-2 py-1.5">
+            <div>
+              <label className="block text-[7px] text-zinc-500 font-bold uppercase mb-0.5">Title (BWF/INFO)</label>
+              <input type="text" value={exportSettings.metaTitle} maxLength="254"
+                onChange={e => setExportSettings(p => ({ ...p, metaTitle: e.target.value }))}
+                placeholder="Tên bài" className="w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none" />
+            </div>
+            <div>
+              <label className="block text-[7px] text-zinc-500 font-bold uppercase mb-0.5">Artist</label>
+              <input type="text" value={exportSettings.metaArtist} maxLength="254"
+                onChange={e => setExportSettings(p => ({ ...p, metaArtist: e.target.value }))}
+                placeholder="Nghệ sĩ" className="w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none" />
+            </div>
+            <div>
+              <label className="block text-[7px] text-zinc-500 font-bold uppercase mb-0.5">ISRC</label>
+              <input type="text" value={exportSettings.metaIsrc} maxLength="12"
+                onChange={e => setExportSettings(p => ({ ...p, metaIsrc: e.target.value.toUpperCase() }))}
+                placeholder="US-ABC-26-00001" className="w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none" />
+            </div>
+          </div>
           <div className="grid grid-cols-3 gap-2 pt-1">
             <button onClick={onBounce} disabled={isExporting}
               title="Bounce realtime — file WAV đầy đủ MIDI + FX Rack + Mastering Chain (chạy lại project thật)"
@@ -18141,7 +18161,11 @@ const App = () => {
     dither: false,
     normalize: false,
     normalizeTarget: '-1dbtp',
-    monoCheck: true
+    monoCheck: true,
+    // Gap 13: BWF/INFO metadata cho WAV mastering export
+    metaTitle: '',
+    metaArtist: '',
+    metaIsrc: ''
   });
   const [serverStatus, setServerStatus] = useState('checking...');
   const _lan = window.SonicRuntime && window.SonicRuntime.capabilities && window.SonicRuntime.capabilities.lan;
@@ -27715,7 +27739,12 @@ const App = () => {
         dither: !!exportSettings.dither,
         normalize: !!exportSettings.normalize,
         normalize_target: exportSettings.normalizeTarget || '-1dbtp',
-        mono_check: !!exportSettings.monoCheck
+        mono_check: !!exportSettings.monoCheck,
+        metadata: {
+          title: exportSettings.metaTitle || '',
+          artist: exportSettings.metaArtist || '',
+          isrc: exportSettings.metaIsrc || ''
+        }
       });
       _lastMasterStats = { lufs: res.lufs, true_peak_db: res.true_peak_db };
       const lufsTxt = (res.lufs !== null && res.lufs !== undefined) ? res.lufs + ' LUFS' : '-- LUFS';
diff --git a/app/static/js/app.precompiled.js b/app/static/js/app.precompiled.js
index 18dfe46..6b41ee7 100644
--- a/app/static/js/app.precompiled.js
+++ b/app/static/js/app.precompiled.js
@@ -768,7 +768,7 @@ const specMods=(spectrumModules?spectrumModules():null)||(getModule?[getModule()
 const applyAll=applyTo||(fn=>{if(typeof window!=='undefined'&&window.__getTrackFxModule){const a=window.__getTrackFxModule(track.id,'eqpro');if(a)fn(a);}if(typeof window!=='undefined'&&window.__getTrackSfFxModule){const b=window.__getTrackSfFxModule(track.id,'eqpro');if(b)fn(b);}});const onDown=e=>{const cv=canvasRef.current,w=cv.clientWidth,h=cv.clientHeight;const{x,y}=toLocal(e);const s=st.current;let hit=false;for(let i=0;i<s.bands.length;i++){const b=s.bands[i];if(Math.hypot(x-eqproFreqToX(b.freq,w),y-eqproGainToY(eqproNodeDb(b),h))<=10){s.selected=i;s.dragId=i;s.mode='center';hit=true;break;}}if(!hit&&s.selected!==null){const b=s.bands[s.selected];const nx=eqproFreqToX(b.freq,w),ny=eqproGainToY(eqproNodeDb(b),h),wo=eqproQToWing(b.q);if(Math.hypot(x-(nx-wo),y-ny)<=8||Math.hypot(x-(nx+wo),y-ny)<=8){s.dragId=s.selected;s.mode='wing';hit=true;}}if(!hit)s.selected=null;try{cv.setPointerCapture(e.pointerId);}catch(err){}setTick(t=>t+1);};const onMove=e=>{const s=st.current;if(s.dragId===null)return;const cv=canvasRef.current,w=cv.clientWidth,h=cv.clientHeight;const{x,y}=toLocal(e);const mx=Math.max(0,Math.min(w,x)),my=Math.max(0,Math.min(h,y));const b=s.bands[s.dragId];if(s.mode==='center'){const f=eqproClamp(parseFloat(eqproXToFreq(mx,w).toFixed(1)),EQPRO_F_MIN,EQPRO_F_MAX);// Filters without a Gain control (highpass/lowpass/notch/bandpass) stay on
 // the 0 dB axis — only frequency is draggable for them.
 const g=eqproBandHasGain(b.type)?eqproClamp(parseFloat(eqproYToGain(my,h).toFixed(1)),-EQPRO_MAX_DB,EQPRO_MAX_DB):0;b.freq=f;b.gain=g;applyAll(mm=>mm.setBand(s.dragId,{freq:f,gain:g}));}else if(s.mode==='wing'){const q=eqproWingToQ(Math.abs(mx-eqproFreqToX(b.freq,w)));b.q=q;applyAll(mm=>mm.setBand(s.dragId,{q}));}setTick(t=>t+1);};const onUp=e=>{const s=st.current;if(s.dragId!==null)commit();s.dragId=null;s.mode=null;try{canvasRef.current.releasePointerCapture(e.pointerId);}catch(err){}};const onWheel=e=>{e.preventDefault();const s=st.current;if(s.selected===null)return;const b=s.bands[s.selected];b.q=eqproClamp(parseFloat((b.q+(e.deltaY<0?0.2:-0.2)).toFixed(1)),0.1,18);applyAll(mm=>mm.setBand(s.selected,{q:b.q}));setTick(t=>t+1);};const onDblClick=e=>{const cv=canvasRef.current,w=cv.clientWidth,h=cv.clientHeight;const{x,y}=toLocal(e);const s=st.current;const hitIdx=s.bands.findIndex(b=>Math.hypot(x-eqproFreqToX(b.freq,w),y-eqproGainToY(b.gain,h))<=10);if(hitIdx!==-1){s.bands.splice(hitIdx,1);if(s.selected===hitIdx)s.selected=null;else if(s.selected!==null&&s.selected>hitIdx)s.selected--;}else{if(s.bands.length>=EQPRO_MAX_BANDS)return;s.bands.push({type:'peaking',freq:eqproClamp(parseFloat(eqproXToFreq(x,w).toFixed(1)),EQPRO_F_MIN,EQPRO_F_MAX),gain:eqproClamp(parseFloat(eqproYToGain(y,h).toFixed(1)),-EQPRO_MAX_DB,EQPRO_MAX_DB),q:1.2,active:true});s.selected=s.bands.length-1;}applyAll(mm=>mm.syncBands(s.bands));commit();setTick(t=>t+1);};const sel=st.current.selected!==null?st.current.bands[st.current.selected]:null;const selIdx=st.current.selected;const cvW=canvasRef.current?canvasRef.current.clientWidth:460;const cvH=240;const hudColor=selIdx!==null?EQPRO_BAND_COLORS[selIdx%EQPRO_BAND_COLORS.length]:EQPRO_BAND_COLORS[0];const hudXY=(()=>{if(st.current.hudPos){// Clamp so the HUD always stays inside the canvas area (buttons clickable).
-return{hx:Math.max(0,Math.min((canvasRef.current?canvasRef.current.clientWidth:460)-268,st.current.hudPos.hx)),hy:Math.max(0,Math.min((canvasRef.current?canvasRef.current.clientHeight:240)-225,st.current.hudPos.hy))};}if(!sel)return null;const nx=eqproFreqToX(sel.freq,cvW),ny=eqproGainToY(sel.gain,cvH);let hx=nx-130,hy=ny-195;if(hx<8)hx=8;if(hx>cvW-268)hx=cvW-268;if(hy<8)hy=ny+24;return{hx,hy};})();return/*#__PURE__*/React.createElement("div",{className:"space-y-2"},/*#__PURE__*/React.createElement("div",{className:"flex items-center justify-between text-[11px] font-mono"},/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-3"},/*#__PURE__*/React.createElement("span",{className:"text-slate-400"},"Bands: ",/*#__PURE__*/React.createElement("span",{className:"text-teal-300 font-bold"},st.current.bands.length),"/8"),/*#__PURE__*/React.createElement("label",{className:"flex items-center gap-1.5"},/*#__PURE__*/React.createElement("span",{className:"text-slate-400"},"Amount:"),/*#__PURE__*/React.createElement("input",{type:"range",min:0,max:200,value:st.current.amount,onChange:e=>{st.current.amount=parseInt(e.target.value);applyAll(mm=>mm.setAmount(st.current.amount));commit();setTick(t=>t+1);},className:"w-20 h-1 cursor-pointer",style:{accentColor:'#2dd4bf'}}),/*#__PURE__*/React.createElement("span",{className:"text-teal-300 font-bold w-10"},st.current.amount,"%"))),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-1"},/*#__PURE__*/React.createElement("button",{onClick:()=>{const s=st.current;s.bands=JSON.parse(JSON.stringify(EQPRO_DEFAULT_BANDS));s.selected=null;applyAll(mm=>mm.syncBands(s.bands));commit();setTick(t=>t+1);},className:"px-2 py-1 bg-slate-800 hover:bg-red-900/60 text-slate-300 border border-slate-700 rounded text-[10px]"},"Reset"),/*#__PURE__*/React.createElement("button",{onClick:()=>{const s=st.current;if(s.bands.length>=EQPRO_MAX_BANDS)return;s.bands.push({type:'peaking',freq:1000,gain:0,q:1.0,active:true});s.selected=s.bands.length-1;applyAll(mm=>mm.syncBands(s.bands));commit();setTick(t=>t+1);},className:"px-2 py-1 bg-teal-900/50 hover:bg-teal-800 text-teal-300 border border-teal-700 rounded text-[10px]"},"+ Band"))),/*#__PURE__*/React.createElement("div",{className:"relative"},/*#__PURE__*/React.createElement("canvas",{ref:canvasRef,className:"w-full h-60 block cursor-crosshair rounded-lg border border-slate-800 bg-slate-950",onPointerDown:onDown,onPointerMove:onMove,onPointerUp:onUp,onWheel:onWheel,onDoubleClick:onDblClick}),sel&&hudXY&&/*#__PURE__*/React.createElement("div",{className:"absolute z-10 w-64 rounded-xl p-3 text-[11px] font-mono space-y-2 pointer-events-auto cursor-move",style:{left:hudXY.hx,top:hudXY.hy,background:'rgba(15,23,42,0.94)',border:'1px solid rgba(45,212,191,0.3)',boxShadow:'0 10px 30px rgba(0,0,0,0.8)',backdropFilter:'blur(12px)'},onPointerDown:e=>{const s=st.current;s.dragHud=true;const r=e.currentTarget.getBoundingClientRect();s.hudOffsetX=e.clientX-r.left;s.hudOffsetY=e.clientY-r.top;e.currentTarget.setPointerCapture(e.pointerId);},onPointerMove:e=>{const s=st.current;if(!s.dragHud)return;const cv=canvasRef.current;const w=cv?cv.clientWidth:460;s.hudPos={hx:Math.max(0,Math.min(w-268,e.clientX-s.hudOffsetX-(cv?cv.getBoundingClientRect().left:0))),hy:Math.max(0,e.clientY-s.hudOffsetY-(cv?cv.getBoundingClientRect().top:0))};setTick(t=>t+1);},onPointerUp:e=>{st.current.dragHud=false;try{e.currentTarget.releasePointerCapture(e.pointerId);}catch(err){}}},/*#__PURE__*/React.createElement("div",{className:"flex items-center justify-between border-b border-slate-700/80 pb-1.5"},/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-2"},/*#__PURE__*/React.createElement("span",{className:"w-4 h-4 rounded-full text-slate-950 font-bold flex items-center justify-center text-[10px]",style:{background:hudColor.badge}},selIdx+1),/*#__PURE__*/React.createElement("span",{className:"font-bold text-white uppercase tracking-wider"},"Band ",selIdx+1)),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-1"},/*#__PURE__*/React.createElement("button",{title:"Bypass band",onClick:()=>{const s=st.current;s.bands[s.selected].active=!s.bands[s.selected].active;applyAll(mm=>mm.setBand(s.selected,{active:s.bands[s.selected].active}));commit();setTick(t=>t+1);},className:`w-5 h-5 rounded flex items-center justify-center text-[10px] ${sel.active?'bg-slate-800 text-slate-400':'bg-amber-600 text-white'}`},/*#__PURE__*/React.createElement("i",{className:"fa-solid fa-power-off"})),/*#__PURE__*/React.createElement("button",{title:"Delete band",onClick:()=>{const s=st.current;s.bands.splice(s.selected,1);s.selected=null;applyAll(mm=>mm.syncBands(s.bands));commit();setTick(t=>t+1);},className:"w-5 h-5 rounded bg-slate-800 hover:bg-red-600 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focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"wav"},"WAV"),/*#__PURE__*/React.createElement("option",{value:"mp3"},"MP3"),/*#__PURE__*/React.createElement("option",{value:"ogg"},"OGG")))),exportSettings.format==='wav'?/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-2"},/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"SR (Hz)"),/*#__PURE__*/React.createElement("select",{value:exportSettings.sampleRate,onChange:e=>setExportSettings(p=>({...p,sampleRate:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"44100"},"44100"),/*#__PURE__*/React.createElement("option",{value:"48000"},"48000"),/*#__PURE__*/React.createElement("option",{value:"96000"},"96000"))),/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"Bit"),/*#__PURE__*/React.createElement("select",{value:exportSettings.bitDepth,onChange:e=>setExportSettings(p=>({...p,bitDepth:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"16"},"16"),/*#__PURE__*/React.createElement("option",{value:"24"},"24"),/*#__PURE__*/React.createElement("option",{value:"float"},"32 float")))):/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-2"},/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"Ch\u1EA5t l\u01B0\u1EE3ng"),/*#__PURE__*/React.createElement("select",{value:exportSettings.quality,onChange:e=>setExportSettings(p=>({...p,quality:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"44khz"},"44kHz"),/*#__PURE__*/React.createElement("option",{value:"lossless"},"Lossless"))),/*#__PURE__*/React.createElement("div",null)),/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-2"},/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"K\xEAnh"),/*#__PURE__*/React.createElement("select",{value:exportSettings.channels,onChange:e=>setExportSettings(p=>({...p,channels:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"mono"},"Mono"),/*#__PURE__*/React.createElement("option",{value:"stereo"},"Stereo"))),/*#__PURE__*/React.createElement("div",null)),/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-2 bg-[#141414] border border-zinc-800 rounded px-2 py-1.5"},/*#__PURE__*/React.createElement("label",{className:"flex items-center gap-1.5 cursor-pointer"},/*#__PURE__*/React.createElement("input",{type:"checkbox",checked:!!exportSettings.dither,onChange:e=>setExportSettings(p=>({...p,dither:e.target.checked})),className:"accent-cyan-500 w-3.5 h-3.5"}),/*#__PURE__*/React.createElement("span",{className:"text-xs text-zinc-300"},"Dither TPDF (PCM 16/24)")),/*#__PURE__*/React.createElement("label",{className:"flex items-center gap-1.5 cursor-pointer"},/*#__PURE__*/React.createElement("input",{type:"checkbox",checked:!!exportSettings.normalize,onChange:e=>setExportSettings(p=>({...p,normalize:e.target.checked})),className:"accent-cyan-500 w-3.5 h-3.5"}),/*#__PURE__*/React.createElement("span",{className:"text-xs text-zinc-300"},"Normalize")),/*#__PURE__*/React.createElement("label",{className:"flex items-center gap-1.5 cursor-pointer"},/*#__PURE__*/React.createElement("input",{type:"checkbox",checked:!!exportSettings.monoCheck,onChange:e=>setExportSettings(p=>({...p,monoCheck:e.target.checked})),className:"accent-cyan-500 w-3.5 h-3.5"}),/*#__PURE__*/React.createElement("span",{className:"text-xs text-zinc-300"},"C\u1EA3nh b\xE1o mono (side/mid)")),/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"Normalize target"),/*#__PURE__*/React.createElement("select",{value:exportSettings.normalizeTarget,onChange:e=>setExportSettings(p=>({...p,normalizeTarget:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"-1dbtp"},"-1 dBTP"),/*#__PURE__*/React.createElement("option",{value:"-14lufs"},"-14 LUFS")))),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-2 pt-1 bg-[#141414] border border-zinc-800 rounded px-2 py-1.5"},/*#__PURE__*/React.createElement("label",{className:"flex items-center gap-1.5 cursor-pointer"},/*#__PURE__*/React.createElement("input",{type:"checkbox",checked:!!exportSettings.loop,onChange:e=>setExportSettings(p=>({...p,loop:e.target.checked})),className:"accent-cyan-500 w-3.5 h-3.5"}),/*#__PURE__*/React.createElement("span",{className:"text-xs text-zinc-300"},"Xu\u1EA5t loop (kh\xF4ng fade in / kh\xF4ng fade out)")),exportSettings.loop&&/*#__PURE__*/React.createElement("label",{className:"flex items-center gap-1 ml-auto"},/*#__PURE__*/React.createElement("span",{className:"text-[7px] text-zinc-500 font-bold uppercase"},"S\u1ED1 \xF4 nh\u1ECBp"),/*#__PURE__*/React.createElement("input",{type:"number",min:"1",max:"256",value:exportSettings.loopBars,onChange:e=>setExportSettings(p=>({...p,loopBars:Math.max(1,parseInt(e.target.value)||1)})),className:"w-16 bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"}))),/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-3 gap-2 pt-1 bg-[#141414] border border-zinc-800 rounded px-2 py-1.5"},/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"Title (BWF/INFO)"),/*#__PURE__*/React.createElement("input",{type:"text",value:exportSettings.metaTitle,maxLength:"254",onChange:e=>setExportSettings(p=>({...p,metaTitle:e.target.value})),placeholder:"T\xEAn b\xE0i",className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"})),/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"Artist"),/*#__PURE__*/React.createElement("input",{type:"text",value:exportSettings.metaArtist,maxLength:"254",onChange:e=>setExportSettings(p=>({...p,metaArtist:e.target.value})),placeholder:"Ngh\u1EC7 s\u0129",className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"})),/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"ISRC"),/*#__PURE__*/React.createElement("input",{type:"text",value:exportSettings.metaIsrc,maxLength:"12",onChange:e=>setExportSettings(p=>({...p,metaIsrc:e.target.value.toUpperCase()})),placeholder:"US-ABC-26-00001",className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"}))),/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-3 gap-2 pt-1"},/*#__PURE__*/React.createElement("button",{onClick:onBounce,disabled:isExporting,title:"Bounce realtime \u2014 file WAV \u0111\u1EA7y \u0111\u1EE7 MIDI + FX Rack + Mastering Chain (ch\u1EA1y l\u1EA1i project th\u1EADt)",className:"w-full py-1 bg-fuchsia-800 hover:bg-fuchsia-700 text-zinc-100 font-bold rounded text-xs flex items-center justify-center gap-1"},/*#__PURE__*/React.createElement("i",{"data-lucide":"radio",className:"w-3 h-3"})," ",isExporting?'...':'Bounce MIDI'),/*#__PURE__*/React.createElement("button",{onClick:onExport,disabled:isExporting,className:"w-full py-1 bg-cyan-700 hover:bg-cyan-600 text-zinc-100 font-bold rounded text-xs flex items-center justify-center gap-1"},/*#__PURE__*/React.createElement("i",{"data-lucide":"download-cloud",className:"w-3 h-3"})," ",isExporting?'...':'Export'),/*#__PURE__*/React.createElement("button",{onClick:onRenderMastering,disabled:isExporting,title:"Render qua engine Python + mastering chain (VST3 bridge) \u2014 bit-depth/SR/dither/normalize (-1dBTP|-14LUFS) + mono side/mid check, tr\u1EA3 LUFS + dBTP",className:"w-full py-1 bg-amber-800 hover:bg-amber-700 text-zinc-100 font-bold rounded text-xs flex items-center justify-center gap-1"},/*#__PURE__*/React.createElement("i",{"data-lucide":"gauge",className:"w-3 h-3"})," ",isExporting?'...':'Mastering')))));};// --- Embedded VST GUI (PLAN_MASTERBUS_VST_GUI_EMBED.md) --------------------
 // Frame-capture + input relay: hiển thị native GUI qua HTTP /frame (~10fps),
 // gửi pointer/key về bridge qua /input. Dùng chung MasteringModal + FXRackModal.
 // url = embed_url từ API fx-gui open (embed:true); onClose khi user đóng;
@@ -1103,7 +1103,8 @@ const[masterMuted,setMasterMuted]=useState(false);// MUTE master
 const[masterAutoVol,setMasterAutoVol]=useState([]);// Gap 7: master volume automation [{time s, db}]
 const[masterAutoOn,setMasterAutoOn]=useState(false);// Gap 7: automation active
 React.useEffect(()=>{window.__masterAutoVol=masterAutoVol;window.__masterAutoOn=masterAutoOn;},[masterAutoVol,masterAutoOn]);React.useEffect(()=>{if(isPlaying&&typeof applyMasterAutomationSchedule==='function'){try{applyMasterAutomationSchedule(currentTimeRef.current||0);}catch(e){console.warn('[Auto] reschedule error:',e);}}},[masterAutoVol,masterAutoOn,isPlaying]);const[masterVU,setMasterVU]=useState(0);// 0-1
-const[masterMeterPeak,setMasterMeterPeak]=useState(0);const[rightSidebarWidth,setRightSidebarWidth]=useState(320);const[tcpWidth,setTcpWidth]=useState(320);const[mediaExplorerHeight,setMediaExplorerHeight]=useState(50);const[panelPositions,setPanelPositions]=useState({export:'bottom',ai:'right',python_tools:'bottom',selection:'bottom',media_explorer:'bottom',fx_rack:'bottom',midi_events:'bottom'});const[panelDropZone,setPanelDropZone]=useState(null);const[dragGhostPos,setDragGhostPos]=useState(null);const[dragGhostPanel,setDragGhostPanel]=useState(null);const panelDragRef=useRef(null);const trackVuRefs=useRef({});const workspaceRef=useRef(null);const colResizerRef=useRef(null);const rowResizerRef=useRef(null);const[aiConfig,setAiConfig]=useState({baseUrl:localStorage.getItem('ai_base_url')||`${API_BASE_URL}`,apiKey:localStorage.getItem('ai_api_key')||'',model:localStorage.getItem('ai_model')||'deepseek-chat'});const[aiProviders,setAiProviders]=useState([]);useEffect(()=>{(async()=>{try{const data=await window.SonicAPI.getAIConfigs();if(data&&data.providers){setAiProviders(data.providers);const active=data.providers.find(p=>p.is_active)||data.providers[0];if(active)setSelectedProviderId(active.id);}}catch(e){/* server may not have config endpoint */}})();},[]);const[analysisState,setAnalysisState]=useState({status:'Sẵn sàng. Chạy AI để phân tích nhịp.',data:null,isRunning:false});const[aiPrompt,setAiPrompt]=useState('');const[aiComposeMode,setAiComposeMode]=useState('SIMILAR_VARIATION');const[promptHistory,setPromptHistory]=useState([]);const[promptHistIdx,setPromptHistIdx]=useState(-1);const promptHistRef=useRef([]);const aiPromptUndoRef=useRef({stack:[],idx:-1,max:30});const aiPromptUndoPush=text=>{const u=aiPromptUndoRef.current;u.stack.push(text);if(u.stack.length>u.max)u.stack.shift();u.idx=u.stack.length-1;};const[aiProvider,setAiProvider]=useState('OpenAI');const[aiModel,setAiModel]=useState('GPT-4o');const[aiActionLog,setAiActionLog]=useState([]);const actionLogContainerRef=useRef(null);useEffect(()=>{if(actionLogContainerRef.current){actionLogContainerRef.current.scrollTop=actionLogContainerRef.current.scrollHeight;}},[aiActionLog]);const[aiProcessing,setAiProcessing]=useState(false);const[aiSuggestions,setAiSuggestions]=useState([]);const[showAiTypeahead,setShowAiTypeahead]=useState(false);const[showAISuggestions,setShowAISuggestions]=useState(true);const[showAIActionLog,setShowAIActionLog]=useState(false);const aiPromptMgrRef=useRef(null);const aiTypeaheadRef=useRef(null);const[selectedProviderId,setSelectedProviderId]=useState('');const[exportSettings,setExportSettings]=useState({sampleRate:'44100',bitDepth:'float',format:'wav',source:'project',quality:'44khz',channels:'stereo',loop:false,loopBars:4,dither:false,normalize:false,normalizeTarget:'-1dbtp',monoCheck:true});const[serverStatus,setServerStatus]=useState('checking...');const _lan=window.SonicRuntime&&window.SonicRuntime.capabilities&&window.SonicRuntime.capabilities.lan;const serverAddr=_lan&&_lan.urls&&_lan.urls[0]?function(){try{return new URL(_lan.urls[0]).host;}catch(e){return null;}}():window.location.host;const[menuOpen,setMenuOpen]=useState(null);const[selectedClipId,setSelectedClipId]=useState(null);// { trackId, clipId }
+const[masterMeterPeak,setMasterMeterPeak]=useState(0);const[rightSidebarWidth,setRightSidebarWidth]=useState(320);const[tcpWidth,setTcpWidth]=useState(320);const[mediaExplorerHeight,setMediaExplorerHeight]=useState(50);const[panelPositions,setPanelPositions]=useState({export:'bottom',ai:'right',python_tools:'bottom',selection:'bottom',media_explorer:'bottom',fx_rack:'bottom',midi_events:'bottom'});const[panelDropZone,setPanelDropZone]=useState(null);const[dragGhostPos,setDragGhostPos]=useState(null);const[dragGhostPanel,setDragGhostPanel]=useState(null);const panelDragRef=useRef(null);const trackVuRefs=useRef({});const workspaceRef=useRef(null);const colResizerRef=useRef(null);const rowResizerRef=useRef(null);const[aiConfig,setAiConfig]=useState({baseUrl:localStorage.getItem('ai_base_url')||`${API_BASE_URL}`,apiKey:localStorage.getItem('ai_api_key')||'',model:localStorage.getItem('ai_model')||'deepseek-chat'});const[aiProviders,setAiProviders]=useState([]);useEffect(()=>{(async()=>{try{const data=await window.SonicAPI.getAIConfigs();if(data&&data.providers){setAiProviders(data.providers);const active=data.providers.find(p=>p.is_active)||data.providers[0];if(active)setSelectedProviderId(active.id);}}catch(e){/* server may not have config endpoint */}})();},[]);const[analysisState,setAnalysisState]=useState({status:'Sẵn sàng. Chạy AI để phân tích nhịp.',data:null,isRunning:false});const[aiPrompt,setAiPrompt]=useState('');const[aiComposeMode,setAiComposeMode]=useState('SIMILAR_VARIATION');const[promptHistory,setPromptHistory]=useState([]);const[promptHistIdx,setPromptHistIdx]=useState(-1);const promptHistRef=useRef([]);const aiPromptUndoRef=useRef({stack:[],idx:-1,max:30});const aiPromptUndoPush=text=>{const u=aiPromptUndoRef.current;u.stack.push(text);if(u.stack.length>u.max)u.stack.shift();u.idx=u.stack.length-1;};const[aiProvider,setAiProvider]=useState('OpenAI');const[aiModel,setAiModel]=useState('GPT-4o');const[aiActionLog,setAiActionLog]=useState([]);const actionLogContainerRef=useRef(null);useEffect(()=>{if(actionLogContainerRef.current){actionLogContainerRef.current.scrollTop=actionLogContainerRef.current.scrollHeight;}},[aiActionLog]);const[aiProcessing,setAiProcessing]=useState(false);const[aiSuggestions,setAiSuggestions]=useState([]);const[showAiTypeahead,setShowAiTypeahead]=useState(false);const[showAISuggestions,setShowAISuggestions]=useState(true);const[showAIActionLog,setShowAIActionLog]=useState(false);const aiPromptMgrRef=useRef(null);const aiTypeaheadRef=useRef(null);const[selectedProviderId,setSelectedProviderId]=useState('');const[exportSettings,setExportSettings]=useState({sampleRate:'44100',bitDepth:'float',format:'wav',source:'project',quality:'44khz',channels:'stereo',loop:false,loopBars:4,dither:false,normalize:false,normalizeTarget:'-1dbtp',monoCheck:true,// Gap 13: BWF/INFO metadata cho WAV mastering export
+metaTitle:'',metaArtist:'',metaIsrc:''});const[serverStatus,setServerStatus]=useState('checking...');const _lan=window.SonicRuntime&&window.SonicRuntime.capabilities&&window.SonicRuntime.capabilities.lan;const serverAddr=_lan&&_lan.urls&&_lan.urls[0]?function(){try{return new URL(_lan.urls[0]).host;}catch(e){return null;}}():window.location.host;const[menuOpen,setMenuOpen]=useState(null);const[selectedClipId,setSelectedClipId]=useState(null);// { trackId, clipId }
 const[stretchedClip,setStretchedClip]=useState(null);// { trackId, clipId, originalDuration, startTime, originalSpeed, beforeSnap }
 const[draggedSectionItem,setDraggedSectionItem]=useState(null);const[resizedSectionItem,setResizedSectionItem]=useState(null);const[editingTrackName,setEditingTrackName]=useState(null);// trackId being edited
 const[editingClipName,setEditingClipName]=useState(null);// { trackId, clipId }
@@ -1979,7 +1980,7 @@ clientSideExport(exportTracks);}finally{setIsExporting(false);}}else{// Client-s
 clientSideExport(exportTracks,{loopStart,loopDur});}};// ── D4: Mastering render qua engine (D3 export stage) ──
 // /api/v1/plugins/render — project schema + mastering chain qua native_bridge
 // (VST3 masterbus), resample/normalize/dither PCM, mono side/mid check.
-const renderMasteringExport=async()=>{if(isExporting)return;if(serverStatus!=='connected'){showToast('Cần kết nối server để render mastering.','warning');return;}setIsExporting(true);try{const schema=serializeProjectToSchema(currentProjectId||'temp_project',projectName||'Dự án tạm chưa lưu',bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume,{volL:masterVolL,volR:masterVolR,link:masterLink,muted:masterMuted});const isFloat=exportSettings.bitDepth==='float';const res=await window.SonicAPI.renderProject(schema,'master_'+Date.now()+'.wav',{bit_depth:isFloat?32:parseInt(exportSettings.bitDepth)||16,sample_rate:parseInt(exportSettings.sampleRate)||44100,dither:!!exportSettings.dither,normalize:!!exportSettings.normalize,normalize_target:exportSettings.normalizeTarget||'-1dbtp',mono_check:!!exportSettings.monoCheck});_lastMasterStats={lufs:res.lufs,true_peak_db:res.true_peak_db};const lufsTxt=res.lufs!==null&&res.lufs!==undefined?res.lufs+' LUFS':'-- LUFS';const tpTxt=res.true_peak_db!==null&&res.true_peak_db!==undefined?res.true_peak_db+' dBTP':'-- dBTP';showToast(`Mastering xong — ${lufsTxt} / ${tpTxt}${res.mono_warning?' • '+res.mono_warning:''}`,'success','Tải về',async()=>{try{const br=await fetch(res.url);if(!br.ok)throw new Error('HTTP '+br.status);const b=await br.blob();const sp=await saveExportViaDialog((projectName||'Project')+'_master.wav',b);if(sp)showToast(`Đã lưu → ${sp}`,'success');}catch(e){const a=document.createElement('a');a.href=res.url;a.download='master.wav';a.click();}});}catch(e){showToast('Render mastering lỗi: '+(e.message||e),'error');}finally{setIsExporting(false);}};// ── Realtime Bounce Export (đầy đủ MIDI + FX Rack + Mastering) ──
+const renderMasteringExport=async()=>{if(isExporting)return;if(serverStatus!=='connected'){showToast('Cần kết nối server để render mastering.','warning');return;}setIsExporting(true);try{const schema=serializeProjectToSchema(currentProjectId||'temp_project',projectName||'Dự án tạm chưa lưu',bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume,{volL:masterVolL,volR:masterVolR,link:masterLink,muted:masterMuted});const isFloat=exportSettings.bitDepth==='float';const res=await window.SonicAPI.renderProject(schema,'master_'+Date.now()+'.wav',{bit_depth:isFloat?32:parseInt(exportSettings.bitDepth)||16,sample_rate:parseInt(exportSettings.sampleRate)||44100,dither:!!exportSettings.dither,normalize:!!exportSettings.normalize,normalize_target:exportSettings.normalizeTarget||'-1dbtp',mono_check:!!exportSettings.monoCheck,metadata:{title:exportSettings.metaTitle||'',artist:exportSettings.metaArtist||'',isrc:exportSettings.metaIsrc||''}});_lastMasterStats={lufs:res.lufs,true_peak_db:res.true_peak_db};const lufsTxt=res.lufs!==null&&res.lufs!==undefined?res.lufs+' LUFS':'-- LUFS';const tpTxt=res.true_peak_db!==null&&res.true_peak_db!==undefined?res.true_peak_db+' dBTP':'-- dBTP';showToast(`Mastering xong — ${lufsTxt} / ${tpTxt}${res.mono_warning?' • '+res.mono_warning:''}`,'success','Tải về',async()=>{try{const br=await fetch(res.url);if(!br.ok)throw new Error('HTTP '+br.status);const b=await br.blob();const sp=await saveExportViaDialog((projectName||'Project')+'_master.wav',b);if(sp)showToast(`Đã lưu → ${sp}`,'success');}catch(e){const a=document.createElement('a');a.href=res.url;a.download='master.wav';a.click();}});}catch(e){showToast('Render mastering lỗi: '+(e.message||e),'error');}finally{setIsExporting(false);}};// ── Realtime Bounce Export (đầy đủ MIDI + FX Rack + Mastering) ──
 // MIDI/soundfont chạy qua FluidSynth (ScriptProcessor) — không render được
 // trong OfflineAudioContext. Vì vậy bounce REALTIME: chạy lại toàn bộ project
 // (audio + MIDI + sections qua FX racks + mastering chain, đúng như nghe) và
diff --git a/app/tasks/worker.py b/app/tasks/worker.py
index 653d0a9..be9222f 100644
--- a/app/tasks/worker.py
+++ b/app/tasks/worker.py
@@ -430,7 +430,7 @@ def cleanup_expired_files_task(max_age_hours: int = 24):
 
 
 @_task
-def render_project_task(project_id: str, project_name: str, project_json_str: str, sample_rate: int = 44100):
+def render_project_task(project_id: str, project_name: str, project_json_str: str, sample_rate: int = 44100, metadata: dict = None):
     """
     Task Celery để kết xuất dự án ngoại tuyến (Offline Project Mixdown) áp dụng specs 30_DAW_ARCHITECT.md.
     """
@@ -442,7 +442,7 @@ def render_project_task(project_id: str, project_name: str, project_json_str: st
     output_path = os.path.join(settings.PROCESSED_DIR, output_filename)
     
     engine = PythonRenderEngine(sample_rate=sample_rate)
-    engine.render_project(project_json, output_path)
+    engine.render_project(project_json, output_path, metadata=metadata or None)
     
     return {
         "project_id": project_id,
diff --git a/app/templates/index.html b/app/templates/index.html
index d728df3..3546a0f 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -51,7 +51,7 @@
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
     <script src="/static/js/services/chordTheory.js?v=202608211300"></script>
-    <script src="/static/js/app.precompiled.js?v=202608212325" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608212340" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {
diff --git a/tests/test_daw_phase5.py b/tests/test_daw_phase5.py
index c4d8783..47e495b 100644
--- a/tests/test_daw_phase5.py
+++ b/tests/test_daw_phase5.py
@@ -857,3 +857,82 @@ def test_65_master_volume_automation(monkeypatch, tmp_path, fx_bridge):
     assert env0 == pytest.approx(base0, rel=0.05), f"đoạn 0dB phải giữ nguyên: {env0} vs {base0}"
     ratio = env1 / max(env0, 1e-9)
     assert 0.20 < ratio < 0.30, f"envelope -12dB → gain ~0.25: {ratio}"
+
+def test_66_bwf_metadata(monkeypatch, tmp_path):
+    """Gap 13: render_project(metadata=...) chen bext + LIST/INFO vao WAV —
+    title/artist/isrc doc lai duoc, PCM bytes khong doi."""
+    monkeypatch.delenv("SF_BRIDGE_PATH", raising=False)
+    from app.core.render_engine import PythonRenderEngine
+    engine = PythonRenderEngine()
+
+    def project():
+        track = _midi_track()
+        track["volume_db"] = -12.0
+        return {
+            "metadata": {"bpm": 120.0, "time_signature_numerator": 4},
+            "main_session": {
+                "length_bars": 1.0,
+                "tracks": [track],
+                "master": {"fx_chain": [], "bypass": False, "volume_db": 0.0},
+            },
+            "section_store": {},
+        }
+
+    def chunks(path):
+        with open(path, "rb") as f:
+            data = f.read()
+        assert data[:4] == b"RIFF" and data[8:12] == b"WAVE"
+        out = {}
+        off = 12
+        while off + 8 <= len(data):
+            cid = data[off:off + 4]
+            size = int.from_bytes(data[off + 4:off + 8], "little")
+            body = data[off + 8:off + 8 + size]
+            if cid == b"data":
+                out[cid] = body
+                break
+            out[cid] = body
+            off += 8 + size + (size % 2)
+        return out
+
+    out_plain = str(tmp_path / "plain.wav")
+    out_meta = str(tmp_path / "meta.wav")
+    engine.render_project(project(), out_plain)
+    engine.render_project(project(), out_meta, metadata={
+        "title": "Test Song",
+        "artist": "Penguin",
+        "isrc": "US-ABC-26-00001",
+        "comment": "Gap 13 check",
+        "description": "BWF description",
+        "originator": "SonicForgeStudio",
+        "originator_reference": "proj-123",
+    })
+    # Khong metadata → khong bext/LIST (backward compatible)
+    cp = chunks(out_plain)
+    assert b"bext" not in cp and b"LIST" not in cp
+
+    cm = chunks(out_meta)
+    assert b"bext" in cm and b"LIST" in cm
+    # bext: description (0:256) + originator (256:288) + originator_reference (288:320)
+    bext = cm[b"bext"]
+    assert bext[0:256].split(b"\x00")[0] == b"BWF description"
+    assert bext[256:288].split(b"\x00")[0] == b"SonicForgeStudio"
+    assert bext[288:320].split(b"\x00")[0] == b"proj-123"
+    # INFO: INAM/IART/ISRC subchunks
+    info = cm[b"LIST"]
+    assert info[:4] == b"INFO"
+    subs = {}
+    off = 4
+    while off + 8 <= len(info):
+        sid = info[off:off + 4]
+        size = int.from_bytes(info[off + 4:off + 8], "little")
+        subs[sid] = info[off + 8:off + 8 + size].rstrip(b"\x00")
+        off += 8 + size + (size % 2)
+    assert subs[b"INAM"] == b"Test Song"
+    assert subs[b"IART"] == b"Penguin"
+    assert subs[b"ISRC"] == b"US-ABC-26-00001"
+    # PCM giong nhau (metadata khong lam doi audio bits)
+    d_plain, sr_plain = _read_wav(out_plain)
+    d_meta, sr_meta = _read_wav(out_meta)
+    assert sr_meta == sr_plain
+    assert np.allclose(d_meta, d_plain, atol=0.0, rtol=0.0)