Gap 10: multiband compressor + de-esser (LR4 crossover, UI, test_62)

tests/test_daw_phase5.py

@@ -656,3 +656,49 @@ def test_60_vst3_setparam_live(fx_bridge, adelay, monkeypatch):
     e_old = 103 * 256 + SR               # echo delay cũ 1s ≈ 70468 (restart/no-apply)
     assert _peak(e_old - 400, e_old + 400) < 0.3,         "param không áp live — echo vẫn ở delay 1s"
     assert _peak(0, e2 - 700) < 0.3, "có tín hiệu lạ trước echo 0.25s"
+
+# ── 5.9 Multiband compressor + De-Esser (PLAN_MASTER_ENHANCE B.10) ──────
+def test_62_multiband_deesser(fx_bridge):
+    """Multiband: GR on active band + unity transparent (LR4 flat).
+    DeEsser: GR at 8kHz (sibilance), 500Hz untouched."""
+    def peak_db(x):
+        # steady-state: nua cuoi (bo transient khoi dau cua HP/crossover filters)
+        m = float(np.max(np.abs(x[:, x.shape[1] // 2:])))
+        return 20.0 * math.log10(max(m, 1e-12))
+
+    def render(chain, freq, amp):
+        t = np.arange(SR * 2) / SR
+        sine = (amp * np.sin(2 * np.pi * freq * t)).astype(np.float32)
+        audio = np.stack([sine, sine])
+        with tempfile.TemporaryDirectory() as td:
+            wav_in = os.path.join(td, "in.wav")
+            _write_wav(wav_in, audio, SR)
+            return _render_bridge(fx_bridge, wav_in, SR, chain, block=512)
+
+    # 1) multiband: low band comp 100Hz (thr -20 ratio 10) -> GR
+    mb_lo = [{"type": "builtin", "id": "multiband", "params": {"lf_cross": 200, "hf_cross": 4000,
+        "low_thr": -20, "low_ratio": 10, "low_makeup": 0, "mid_thr": -80, "mid_ratio": 1,
+        "mid_makeup": 0, "high_thr": -80, "high_ratio": 1, "high_makeup": 0}}]
+    out = render(mb_lo, 100.0, 0.5)
+    g = peak_db(out)
+    assert g < -12.0, f"low comp GR weak: {g:.1f}dBFS (expect <-12)"
+
+    # 2) multiband: unity transparent +-0.5dB (LR4 crossover flat)
+    mb_unity = [{"type": "builtin", "id": "multiband", "params": {"lf_cross": 200, "hf_cross": 4000,
+        "low_thr": -10, "low_ratio": 1, "low_makeup": 0, "mid_thr": -10, "mid_ratio": 1,
+        "mid_makeup": 0, "high_thr": -10, "high_ratio": 1, "high_makeup": 0}}]
+    for freq in (100.0, 1000.0, 8000.0):
+        out = render(mb_unity, freq, 0.5)
+        g = peak_db(out)
+        assert -6.5 <= g <= -5.5, f"multiband unity {freq}Hz: {g:.2f}dBFS (expect ~-6.02)"
+
+    # 3) deesser: 8kHz GR (thr -30 ratio 100 freq 6000)
+    de = [{"type": "builtin", "id": "deesser", "params": {"threshold": -30, "ratio": 100, "freq": 6000, "makeup": 0}}]
+    out = render(de, 8000.0, 0.7)
+    g = peak_db(out)
+    assert g < -15.0, f"deesser 8kHz GR weak: {g:.1f}dBFS (expect <-15)"
+
+    # 4) deesser: 500Hz unchanged +-0.5dB
+    out = render(de, 500.0, 0.5)
+    g = peak_db(out)
+    assert -6.5 <= g <= -5.5, f"deesser 500Hz changed: {g:.2f}dBFS (expect ~-6.02)"