From 466b2022f24cbe77b808b9989ce49097ea1a8a85 Mon Sep 17 00:00:00 2001
From: locphamtran <tranloclqd@gmail.com>
Date: Wed, 19 Aug 2026 10:56:21 +0700
Subject: [PATCH] fix(fx): apply preset_b64 in realtime FX chain (issue 4)

---
 native_bridge/src/RenderFxJob.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/native_bridge/src/RenderFxJob.cpp b/native_bridge/src/RenderFxJob.cpp
index 9255f7e..d6c3a3b 100644
--- a/native_bridge/src/RenderFxJob.cpp
+++ b/native_bridge/src/RenderFxJob.cpp
@@ -1051,7 +1051,16 @@ std::shared_ptr<RealtimeFxChain::Impl::Chain> RealtimeFxChain::Impl::buildChain(
         ent.bypass = memberInt(o, "bypass", 0) != 0;
         if (!ent.bypass) {
             auto fx = std::make_shared<Vst3Fx>();
-            if (fx->load(path, sampleRate_, blockSize_)) ent.fx = std::move(fx);
+            if (fx->load(path, sampleRate_, blockSize_)) {
+                const std::string preset = memberString(o, "preset_b64", "");
+                if (!preset.empty()) {
+                    if (fx->applyPreset(preset))
+                        std::cerr << "[RealtimeFx] preset applied: " << path << std::endl;
+                    else
+                        std::cerr << "[RealtimeFx] preset apply FAILED (default kept): " << path << std::endl;
+                }
+                ent.fx = std::move(fx);
+            }
             else {
                 std::cerr << "[RealtimeFx] load failed — slot bypassed: " << path << std::endl;
                 ent.bypass = true;