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Okay, synthesizer patch nerds ...

I've been struggling to replicate this "swishy tremolo" for the last couple days without success (clip from Chris Abbott's remix of Driller, on Back In Time 2):

http://www.floodgap.com/temp/throbber.mp3

I know this was an incredibly common effect during the 80s. What was the synth, a DX7? What was the patch, and how would you describe it so it can be recreated? I can emulate the tremolo, and the slowly panning resonance filter, but I'm having trouble with the "swishy attack" on each beat.
smit happens.

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