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chore: add fluidsynth fix log to wiki

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3dtours
2026-07-26 17:08:49 +07:00
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### [2026-07-26 17:05] Task: Fix FluidSynth API mismatch (silent fallback)
- **Tóm tắt thay đổi:** Pyfluidsynth thực tế là low-level CFFI wrapper, không có class `FluidSynth()`. Dùng sai API → tất cả SoundFont render fallback về oscillator (silence). Fix: dùng `new_fluid_synth`, `fluid_synth_sfload`, `fluid_synth_program_select`, `fluid_synth_write_s16_stereo`. Đồng bộ internal clock bằng cách render silence qua `write_s16_stereo` thay vì chỉ advance cursor.
- **Các file ảnh hưởng:** `app/core/render_engine.py`
- **Ghi chú/Test (nếu có):** DSK BAN-DI (prog=5) và SGM Brass (prog=56) đều có audio riêng biệt. Render peak ~0.04-0.056, spectral profile khác nhau rõ rệt.
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### [2026-07-26 16:55] Task: Fix SoundFont program selection flow ### [2026-07-26 16:55] Task: Fix SoundFont program selection flow
- **Tóm tắt thay đổi:** Sửa `_find_sf2_path` case-insensitive (catalog IDs lowercase vs filename mixed-case), thêm `synth_engine`, `soundfont_id`, `instrument_source` vào serialize/deserialize để project save/load không mất instrument selection. - **Tóm tắt thay đổi:** Sửa `_find_sf2_path` case-insensitive (catalog IDs lowercase vs filename mixed-case), thêm `synth_engine`, `soundfont_id`, `instrument_source` vào serialize/deserialize để project save/load không mất instrument selection.
- **Các file ảnh hưởng:** `app/core/render_engine.py`, `app/static/js/app.jsx` - **Các file ảnh hưởng:** `app/core/render_engine.py`, `app/static/js/app.jsx`