I'm assembling a compilation to burn off to a DVD or CD. Most of the tracks are FLAC, a few are MP3 and it is essentially one track per artist/album. I want to avoid jarring volume changes between tracks (playlist order cannot be changed). Foobar gives me three different choices when applying ReplayGain: (1) scan per track gain, (2) scan selection as a single album or (3) scan selections as albums (by tags).
If I apply ReplayGain to all the tracks at once, which alternative should I apply?