Alien Drums

I don't think Genes drumming/drums need any triggers to sound metal, but then again, Dev is into technology, so he probably did add some mix of sampled drumsound at least to the kickdrum while mixing.
 
In the liner stuff for Chaos Years, Gene says that he hated his snare sound on Alien except for on "Zen".

I don't know if I would say "hate", but I think the drum sound on Alien is the weakest part of the mix. Don't get me wrong, Gene's drum parts are phenomenal on that album but yeah, I'm not a fan of those drum samples.

Thanks for posting that video though, I saw that once I think but totally forgot about it. I'm a total whore for studio videos.