diff --git a/dsp/common.py b/dsp/common.py
index 145a95e..1d9db55 100644
--- a/dsp/common.py
+++ b/dsp/common.py
@@ -21,7 +21,8 @@ import struct
 EQ_BANDS = 32
 CHANNELS = 2
 EQ_PATH = "/dev/shm/collaplex-eq"
-LOCK_PATH = "/dev/shm/collaplex-eq.ch"
+LOCK_PATH = "/dev/shm/collaplex-eq.lock"
+LOUDNESS_SHM = "/dev/shm/collaplex-loudness"
 
 GAIN_LIMIT = 15.0
 VOLUME_LIMIT = 12.0
@@ -39,6 +40,7 @@ _PARAMS = struct.Struct("<34d")     # 32 段增益 + 总音量 + 湿量
 _VER = struct.Struct("<I")          # 参数版本号
 _CH = struct.Struct("<6d")          # in_rms in_peak out_rms out_peak gain_db 保留
 _STATE = struct.Struct("<12d")      # 2 声道
+_LOUD_F = struct.Struct("<f")       # 归一化 DSP 状态里的单精度字段
 
 PARAMS_OFF = 0
 VER_OFF = _PARAMS.size
@@ -124,3 +126,29 @@ def claim_channel() -> int:
 def defaults() -> tuple[list[float], float, float]:
     """默认参数: 全平直 + 0 dB 总音量 + 0.3 混响湿量。"""
     return [0.0] * EQ_BANDS, 0.0, 0.3
+
+
+def read_loudness_state() -> dict[str, object]:
+    """读响度归一化 DSP 的状态: 它看到的电平与当前施加的增益。
+
+    DSP 侧布局(每声道 32 字节, 见 dsp/loudness_norm.py):
+        +0 平滑能量   +4 块能量   +8 输入峰值   +12 当前增益(dB)
+        +64 目标响度(dB)
+    peak 是线性幅度, 前端自己转 dBFS。
+    """
+    try:
+        with open(LOUDNESS_SHM, "rb") as fh:
+            mm = mmap.mmap(fh.fileno(), 0, prot=mmap.PROT_READ)
+            try:
+                peaks = [_LOUD_F.unpack_from(mm, ch * 32 + 8)[0] for ch in range(CHANNELS)]
+                gains = [_LOUD_F.unpack_from(mm, ch * 32 + 12)[0] for ch in range(CHANNELS)]
+                target = _LOUD_F.unpack_from(mm, 64)[0]
+            finally:
+                mm.close()
+    except (OSError, ValueError):
+        return {"peak": [-120.0, -120.0], "gain_db": [0.0, 0.0], "target_db": -16.0}
+    return {
+        "peak": [float(p) for p in peaks],
+        "gain_db": [float(g) for g in gains],
+        "target_db": float(target),
+    }
diff --git a/web/index.html b/web/index.html
index 06f89fb..8d9b5ac 100644
--- a/web/index.html
+++ b/web/index.html
@@ -43,6 +43,16 @@ input[type=range]::-moz-range-track{height:4px;background:var(--bd-hi);border-ra
 input[type=range]::-moz-range-thumb{width:14px;height:14px;border:none;border-radius:50%;background:var(--ok)}
 .hint{color:var(--dim);font-size:10px;margin-top:8px}
 
+/* ---- 归一化的电平与动态增益 ---- */
+.viz{display:flex;align-items:center;gap:9px;margin-top:9px;padding-left:110px}
+.viz .lbl{width:70px;flex:none;color:var(--mut);font-size:11px}
+.viz .bar{flex:1;height:10px;border-radius:3px}
+.viz .gauge{position:relative;flex:1;height:10px;background:#111;border:1px solid var(--bd);border-radius:3px}
+.viz .gauge::before{content:"";position:absolute;left:60%;top:-2px;width:1px;height:12px;background:var(--dim)}
+.viz .gauge i{position:absolute;top:-3px;width:6px;height:14px;border-radius:2px;background:var(--ok);
+              transform:translateX(-50%);transition:left .12s linear}
+.viz .num{width:84px;flex:none;text-align:right;color:var(--fg);font-variant-numeric:tabular-nums}
+
 /* ---- EQ ---- */
 .eq{display:flex;align-items:flex-end;gap:3px;height:190px;padding-top:6px}
 .band{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;height:100%}
@@ -87,6 +97,16 @@ button:hover{border-color:var(--ok);color:var(--ok)}
     <input type="range" id="loud" min="-30" max="-6" step="0.5">
     <span class="num" id="loud-num">—</span>
   </div>
+  <div class="viz">
+    <span class="lbl">输入电平</span>
+    <div class="bar"><i id="bar-loud"></i></div>
+    <span class="num" id="loud-in">-∞</span>
+  </div>
+  <div class="viz">
+    <span class="lbl">动态增益</span>
+    <div class="gauge"><i id="loud-gain" style="left:60%"></i></div>
+    <span class="num" id="loud-gain-num">—</span>
+  </div>
   <div class="row">
     <span class="name">混响湿度</span>
     <input type="range" id="wet" min="0" max="1" step="0.01">
@@ -134,6 +154,22 @@ function bindWheel(input, onDelta, onDone) {
 
 /* ---------- 三个控制滑块 ---------- */
 const loud = el("loud"), wet = el("wet"), vol = el("vol");
+
+/* 正在拖动/滚动的控件不能再用轮询结果覆盖 —— 否则每 250ms 弹回一次, 表现为
+   "推上去自己弹下来, 要试好几次才到位"。原先用 document.activeElement 判断,
+   但鼠标拖动时焦点常常不在滑块上, 所以改用显式标志 + 松手后的短暂静默期。 */
+const busy = {};
+const markBusy = (k, ms) => { busy[k] = Date.now() + ms; };
+const isBusy = (k) => (busy[k] || 0) > Date.now();
+[["loud", loud], ["wet", wet], ["vol", vol]].forEach(([k, s]) => {
+  s.addEventListener("pointerdown", () => markBusy(k, 1e7));   // 拖动期间一直忙
+  const release = () => markBusy(k, 600);                      // 松手后 0.6s 内别覆盖
+  s.addEventListener("pointerup", release);
+  s.addEventListener("pointercancel", release);
+  s.addEventListener("blur", release);
+  s.addEventListener("keydown", () => markBusy(k, 600));
+  s.addEventListener("wheel", () => markBusy(k, 700), {passive:true});
+});
 loud.addEventListener("input", () => el("loud-num").textContent = (+loud.value).toFixed(1) + " dB");
 wet.addEventListener("input", () => el("wet-num").textContent = (+wet.value).toFixed(2));
 vol.addEventListener("input", () => el("vol-num").textContent = (+vol.value >= 0 ? "+" : "") + (+vol.value).toFixed(1) + " dB");
@@ -204,6 +240,19 @@ function updateMeters(levels) {
   }
 }
 
+/* ---------- 归一化的电平与动态增益 ---------- */
+function updateLoud(ll) {
+  if (!ll) return;
+  const pk = Math.max(ll.peak[0], ll.peak[1]);
+  const pkDb = 20 * Math.log10(Math.max(pk, 1e-6));
+  el("bar-loud").style.width = Math.max(0, Math.min(100, (pkDb + 60) / 60 * 100)) + "%";
+  el("loud-in").textContent = (pkDb <= -119 ? "-∞" : pkDb.toFixed(1)) + " dBFS";
+  const g = (ll.gain_db[0] + ll.gain_db[1]) / 2;      // 两声道共用同一增益
+  el("loud-gain-num").textContent = (g >= 0 ? "+" : "") + g.toFixed(1) + " dB";
+  // 推子: 量程 -18 ~ +12 dB, 0 dB 落在 60% 处(与刻度线对齐)
+  el("loud-gain").style.left = Math.max(0, Math.min(100, (g + 18) / 30 * 100)) + "%";
+}
+
 /* ---------- 轮询 ---------- */
 async function tick() {
   try {
@@ -219,10 +268,11 @@ async function tick() {
         v.textContent = val === 0 ? "" : (val > 0 ? "+" : "") + val.toFixed(1);
       });
     }
-    if (document.activeElement !== vol) { vol.value = d.volume_db; el("vol-num").textContent = (d.volume_db >= 0 ? "+" : "") + d.volume_db.toFixed(1) + " dB"; }
-    if (document.activeElement !== wet) { wet.value = d.wet; el("wet-num").textContent = (+d.wet).toFixed(2); }
-    if (document.activeElement !== loud && d.loudness) { loud.value = d.loudness.target_db; el("loud-num").textContent = (+d.loudness.target_db).toFixed(1) + " dB"; }
+    if (!isBusy("vol")) { vol.value = d.volume_db; el("vol-num").textContent = (d.volume_db >= 0 ? "+" : "") + d.volume_db.toFixed(1) + " dB"; }
+    if (!isBusy("wet")) { wet.value = d.wet; el("wet-num").textContent = (+d.wet).toFixed(2); }
+    if (!isBusy("loud") && d.loudness) { loud.value = d.loudness.target_db; el("loud-num").textContent = (+d.loudness.target_db).toFixed(1) + " dB"; }
     updateMeters(d.levels);
+    updateLoud(d.loudness_levels);
     state = d;
   } catch (e) { say("面板与 DSP 失联"); }
 }
diff --git a/web/server.py b/web/server.py
index da9b479..62a0cfc 100644
--- a/web/server.py
+++ b/web/server.py
@@ -108,6 +108,7 @@ class Handler(BaseHTTPRequestHandler):
                 levels = common.read_state(self.store)
             self._send_json({
                 "freqs": common.EQ_FREQS,
+                "loudness_levels": common.read_loudness_state(),
                 "gains": gains,
                 "volume_db": volume_db,
                 "wet": wet,
diff --git a/测试/cdp_拖动验证.py b/测试/cdp_拖动验证.py
new file mode 100644
index 0000000..b6126cb
--- /dev/null
+++ b/测试/cdp_拖动验证.py
@@ -0,0 +1,72 @@
+"""用 CDP 发真实鼠标拖动, 验证总音量滑块不再被轮询弹回。
+
+修前: 拖动中每 250ms 被 /api/state 覆盖 -> 松手后跳回旧值
+修后: busy 标志挡住覆盖 -> 停在拖到的位置并生效
+"""
+from __future__ import annotations
+
+import json
+import subprocess
+import time
+import urllib.request
+
+import websocket
+
+API = "http://127.0.0.1:8789"
+
+page = subprocess.Popen([
+    "google-chrome", "--headless=new", "--disable-gpu",
+    "--remote-debugging-port=9333", "--remote-allow-origins=*",
+    "--user-data-dir=/tmp/cxchrome3", API],
+    stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+time.sleep(4)
+
+tabs = json.load(urllib.request.urlopen("http://127.0.0.1:9333/json/list", timeout=15))
+ws_url = [t for t in tabs if t.get("type") == "page"][0]["webSocketDebuggerUrl"]
+ws = websocket.create_connection(ws_url, timeout=25)
+_mid = [0]
+
+
+def cmd(method: str, **params: object) -> dict:
+    _mid[0] += 1
+    ws.send(json.dumps({"id": _mid[0], "method": method, "params": params}))
+    while True:
+        msg = json.loads(ws.recv())
+        if msg.get("id") == _mid[0]:
+            return msg.get("result") or {}
+
+
+def js(expr: str) -> object:
+    res = cmd("Runtime.evaluate", expression=expr, returnByValue=True)
+    return (res.get("result") or {}).get("value")
+
+
+box = js("(() => { const r = document.getElementById('vol').getBoundingClientRect();"
+         " return [r.left, r.top + r.height/2, r.width, r.height]; })()")
+before = js("document.getElementById('vol').value")
+print("滑块 box =", box, " 拖动前 vol =", before)
+
+x1 = box[0] + box[2] * 0.5
+x2 = box[0] + box[2] * 0.92
+y = box[1]
+cmd("Input.dispatchMouseEvent", type="mousePressed", x=x1, y=y, button="left", clickCount=1)
+for i in range(1, 11):
+    cmd("Input.dispatchMouseEvent", type="mouseMoved",
+        x=x1 + (x2 - x1) * i / 10.0, y=y, button="left")
+    time.sleep(0.09)
+dragging = js("document.getElementById('vol').value")
+cmd("Input.dispatchMouseEvent", type="mouseReleased", x=x2, y=y, button="left", clickCount=1)
+time.sleep(0.15)
+just_up = js("document.getElementById('vol').value")
+print("拖动中 vol =", dragging, " 刚松手 vol =", just_up)
+
+time.sleep(1.5)
+after = js("document.getElementById('vol').value")
+srv = json.load(urllib.request.urlopen(API + "/api/state", timeout=15))
+print("1.5 秒后 vol =", after, " 服务端 volume_db =", srv["volume_db"])
+
+same = abs(float(after) - float(just_up)) < 0.01
+synced = abs(float(after) - float(srv["volume_db"])) < 0.51
+print("结果:", "滑块停住且已生效 OK" if (same and synced) else "仍有回弹/未同步 FAIL")
+ws.close()
+page.terminate()