I thought it might be interesting to see what the PowerTracks Help file says -

Pre Normalize-- Pre-scan each file, to determine how much gain should be applied to raise the level of the track to -0.3 dB full scale. The 0.3 dB headroom is left at the top, because some oversampling DA converters do not perform very well at full-scale levels. They sometimes make distortion from arithmetic overflow.

Gain Change-- The amount of boost to be applied to a track. If Pre Normalize is enabled, the Gain Change amount is added to the normalize boost. Positive Gain can cause clipping unless Post Peak Limit is also enabled. There is never any risk of clipping with negative gain.

Post Peak Limit-- An instant-attack, program-dependent-release Peak Limiter. The Peak Limiter protects the final output from clipping, by automatically "turning down the gain" on loud peaks.

ROG.

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