import io

p = r"C:/Users/locpham/SonicForgeStudio/native_bridge/src/NativeInstrumentEngine.cpp"
with io.open(p, "r", encoding="utf-8-sig", newline="") as f:
    s = f.read()

old = """    const float kCeilingPeak = 0.7071f;  // -3 dBFS
    const float kAttack = 0.9f;  // chặt: sample dau keo ve tran ~90% (tran 0.4 de lo qua -3 dBFS)
    const float kRelease = 0.0006f;"""
new = """    const float kCeilingPeak = 0.7071f;  // -3 dBFS
    // Attack 0.9 (near-instant) caused zipper crackle: nhieu track sum ~2.0,
    // target 0.35 -> gain 1.0->0.42 trong 1 sample = step -7.6 dB moi transient.
    // 0.1 = ~10 samples (0.2ms @48k) ve tran: smooth, van giu ceiling -3 dBFS.
    const float kAttack = 0.1f;
    const float kRelease = 0.0006f;"""

assert s.count(old) == 1, "pattern not found: %d" % s.count(old)
s = s.replace(old, new)

with io.open(p, "w", encoding="utf-8-sig", newline="") as f:
    f.write(s)
print("patched OK")