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On the assumption that you're speaking to the drop in pitch without losing tempo and aren't referring to the staccato chord attacks that occur subsequent to it, it sounds like a loop of machinery lowered in pitch while it's kept at tempo over a period of time, thus creating a psycho-acoustically wonky Doppler effect, that because it doesn't really change its timing, screws with ones perception.
It can probably be done in most audio editors using a pitch shifter. In CoolEdit Pro, you can set up a pitch shift over time to a spline of your choosing.
I wish I had CoolEdit Pro. 
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