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- Loudness should only be increased when the track sounds as good as or better than the
   version without loudness processing while using loudness-compensated A/B comparision.

- Peak leveling takes place according to BS 1770-based True Peak Level (TPL) measurement
   with a maximum value of minus 0.5dB TPL, so that subsequent processes like DA conversion
   and mp3/AAC encoding takes place without or at least with very low distortion.

(Excerpt from Audio Mastering with PC Workstations)