Fix: master FX chain khong xu ly sau khi load project — deserialize composite master.bypass thanh vstBypass=true loai het VST3 khoi fxRtChain (chain=[] → fxRtStart early-return → masterBus pass-through, offline export cung tat). Deserializer gio hardcode vstBypass=false (khong co UI nao set flag nay cho master; chi ton tai tu bug deserialize). Build lai app.precompiled.js + copy 3 ban deploy + cache-buster moi. Verify UI: LOADED vstBypass=false, chain VST3 Ozone giu, fxRtChainLen=1; play → fxRt.active=true ws OPEN inQueue=64; DB save moi master.bypass=false.

app/static/js/app.jsx

@@ -11771,7 +11771,13 @@ const deserializeProjectFromSchema = (schemaObj) => {
         ...migrated,
         chain: _finalChain,
         vstFxChain: _finalChain.filter(m => m.type === 'vst3').map(s => ({ type: 'vst3', path: s.path || '', name: s.name || '', preset_b64: s.preset_b64 || '', bypass: !!s.bypass })),
-        vstBypass: !!_masterBus.bypass,
+        // FIX (master FX "mất" trên project cũ): main_session.master.bypass là
+        // composite cũ (bypass: !masterConnected || vstBypass) — project lưu khi
+        // tắt master → bypass=true → deserialize thành vstBypass=true vĩnh viễn
+        // → fxRtChain() filter bỏ VST3 + masterVstOn tắt → master FX không xử lý
+        // realtime lẫn offline export sau khi load. Không có UI nào set vstBypass
+        // cho master (chỉ có slot.bypass riêng) → luôn khôi phục false.
+        vstBypass: false,
         gui_open_path: (schemaObj.mastering_settings && schemaObj.mastering_settings.gui_open_path) ? schemaObj.mastering_settings.gui_open_path : null,
         gui_open_name: (schemaObj.mastering_settings && schemaObj.mastering_settings.gui_open_name) ? schemaObj.mastering_settings.gui_open_name : null
       };