Sounds like a reversed saturated synth bass with a timed tremolo.
Focus on the spectral parts of the sound and find something close first, then play around with reversing it.Then add a quarter or eight note tremolo on it.
What exactly do you want to know?
The sound itself seems to be a very hard bass synth. You can only hear it for a fraction of a second
The motion is probably a different sidechained instrument (not a kick in the case) which influences the filter.
Since it's very irregular it could also be played with a modulation wheel once and the recorded automation was copied or the whole pattern was recorded.
I would go with Magnus that the sound is also reversed, but I can't hear a 8th tremolo. Isn't the motion is too unsteady for that?
This reply was modified 3 years ago by Guido tum Suden.