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docs/slides/60-audio.md

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+Audio
+### Clean Audio = Believable Video
+
+> Viewers forgive shaky images far sooner than noisy sound.
+
+Note:
+Start by playing two identical clips—one with background hiss, one cleaned—and ask which looks “more professional.”
+
+--
+
+Audio
+#### 1. Capture at the Source
+
+* Use the best mic available; position 15–30 cm from mouth.
+* Monitor with headphones; peaks should stay below –6 dB.
+* Record at least 10 s **room‑tone** in every location.
+
+Note:
+Emphasise that good capture saves hours in post; show how red‑lined peaks distort irreversibly.
+
+--
+
+Audio
+#### 2. Room‑Tone & Noise Control (Audacity)
+
+1. Import clip.
+2. Select clean room‑tone → **Effect ▸ Noise Reduction ▸ Get Profile**.
+3. Select entire track → repeat Noise Reduction (6–12 dB reduction, Sensitivity 6, Frequency Smoothing 3).
+4. Apply **High‑Pass Filter 80 Hz** to remove rumble.
+
+Note:
+Warn that over‑reduction causes “swirly” artefacts—dial Sensitivity down if it sounds robotic.
+
+--
+
+Audio
+#### 3. Equalize & Compress
+
+* Roll off <80 Hz; dip 4 kHz to tame harshness.
+* Compressor: Threshold ‑6 dB, Ratio 3:1, Attack 10 ms, Release 150 ms.
+* Limit peaks to ‑1 dB; aim for dialogue ≈‑12 LUFS.
+
+Note:
+Show LUFS meter in Kdenlive (View ▸ Audio Meter) and explain web loudness target (‑14 LUFS) versus broadcast (‑23 LUFS).
+
+--
+
+Audio
+#### 4. Sync & Layering
+
+* Align tracks via the **hand‑clap spike** in waveforms.
+* Keep voice‑off on dedicated top audio track; ambience/FX below.
+* Add 3‑frame fades at every cut to kill pops.
+
+Note:
+Demo Kdenlive’s *Align Audio to Reference* for quick waveform sync—the same tool used in multicam earlier.
+
+--
+
+Audio
+#### 5. Export Best Quality
+
+* Export **WAV 48 kHz 24‑bit** from Audacity.
+* In Kdenlive Render: AAC 48 kHz, 192 kb/s (YouTube preset is fine).
+* Watch meters during render; ensure no clipping.
+
+Note:
+Clarify that archive masters stay lossless; delivery formats can be lossy.
+
+