What mastering actually does.

Raw AI narration vs. Narrato-mastered output.
Same audio. Before and after.

✗ Before mastering — raw output
RMS Level -16.2 dB FAIL
Peak Level -1.8 dB FAIL
Noise Floor -55 dB WARN
Sample Rate 48000 Hz WARN
Bitrate 128 kbps FAIL
Head Silence 0.12s FAIL
Tail Silence 0.3s FAIL
✗ 5 failures, 2 warnings — this file would be rejected by every platform
→
✓ After mastering — Narrato output
RMS Level -20.3 dB PASS
Peak Level -3.8 dB PASS
Noise Floor -62 dB PASS
Sample Rate 44100 Hz PASS
Bitrate 192 kbps PASS
Head Silence 0.75s PASS
Tail Silence 2.1s PASS
✓ All metrics pass — ready to publish on every platform

Platform compliance — after mastering

Your mastered files checked against every major distribution platform.

Metric Your audioFindaway VoicesGoogle Play BooksApple BooksKoboACX / Audible
RMS Level-20.3 dB-23.0 to -18.0 dB-23.0 to -18.0 dB-23.0 to -18.0 dB-23.0 to -18.0 dB-23.0 to -18.0 dB
Peak Level-3.8 dB≤ -3.0 dB≤ -3.0 dB≤ -3.0 dB≤ -3.0 dB≤ -3.0 dB
Noise Floor-62 dB≤ -60.0 dB≤ -60.0 dB≤ -60.0 dB≤ -60.0 dB≤ -60.0 dB
Sample Rate44100 Hz44100 Hz44100 Hz44100 Hz44100 Hz44100 Hz
Head Silence0.75s0.5–1.0s0.5–1.0s0.5–1.0s0.5–1.0s0.5–1.0s
Tail Silence2.1s1.0–5.0s1.0–5.0s1.0–5.0s1.0–5.0s1.0–5.0s

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