I'm not familiar with the song, but I find a great one to make disturbing effects is Buffer Override, which is a free download on this site. You can automate it to get a varying sound, which I find works best. Experiment with it.

There's also the more conventional chorus and distortion, delay etc.
There is poetry in despair.
tou can get some really cool sounds with phase shifting as well, that's actually quite popular with EBM bands at the moment.
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sounds like a "telephone" type effect which is done with EQ (cut everything but the mids)
then it sounds like that "robot effect which can be done with Sonar (V-Vocal pitch corrector)
Some chorus added gives that flanger type effect.
Also add some distortion