I googled it for you, and I found an old guitar magazine article that says this:

'Its eerie intro consists of Denis’ guitar processed into cut-up staccato blips by a Yamaha SPX90 with its noise gate engaged. “I just went crazy scratching the chords very fast,” he explains. “I was trying to simulate what the keyboard did on Pink Floyd’s album.”'

http://voivod.net/1992/03/15/1992-03-guitar-player-magazine-interview/

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[–] InevitableSwing@hexbear.net 2 points 2 years ago

harsh (square) tremolo

Ah - another piece of the puzzle I didn't know.