What do Gary Holt and Lee Altus normally tune in? I've tabbed a couple of songs from Shovel Headed Kill Machine in D standard but I've tried Funeral Hymn from Atrocity Exhibition : Exhibit A and it seems like the song's only possible in dropped D. That's what the latest Guitar Pro tab for that song is using.

Just wondering if anybody knew what tuning they normally used, or maybe they mix it up depending on the song.