Over the years, I've done a few tapping parts on the Cannibal Corpse albums. On our most recent release "Kill" there is a bass tapping section at the beginning of the song "The Discipline of Revenge". The tempo is slow (around 95 bpm) but the bass tapping is flying by pretty quickly since the entire part is 32nd notes. It's actually a fairly easy part to play though.
The whole part simply alternates between two notes tapped with the left hand, and two tapped with the right. I think it would be easiest to learn this part four notes at a time. Wait until you're able to play each four note section smoothly before you try playing the whole thing. The left hand notes begin each four note group, followed by the right (if you play bass right-handed; lefties can just reverse this). As usual, practice this slowly, and increase your practice tempos gradually until you can play the part up to speed.
Notice that this is another bass part featuring lots of diminished 5th intervals. If you try figuring out any of our songs, you'll see that that interval is probably in about 90% of our songs. When you're looking for a dark, ominous sound, the diminished 5th (the tritone) is hard to beat.
