While mastering in Sequoia 8.1 with Neon HR 1.1, I've been getting some faint distortion in a few places on the mixdown track. But the distortion wouldn't be there on playback prior to mixdown. Only after mixdown, and always in the same one or two places. Very frustrating. While the song sounded awesome prior to mixdown, I ended up abandoning Neon for Algorithmix EQ (blue).