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@@ -180,7 +180,7 @@ y[n] = 2r·cos(ω₀)·y[n-1] − r²·y[n-2] + A(t)·√(1−r²)·noise[n]
| `gain` | 1.0 | [0, ∞) | Output multiplier on top of power normalization. |
**Coefficient translation from spread:**
-`r = exp(−π · BW / SR)` where `BW = f₀ · (spread_above + spread_below) / 2`.
+`r = exp(−π · BW / SR)` where `BW = f₀ · spread`.
For a partial at 440 Hz with `spread = 0.02`: `BW ≈ 8.8 Hz`, `r ≈ exp(−π·8.8/32000) ≈ 0.9991`.
**When to use:**