Patch Request: Transa - Transtar (Classic Trance Bass)

Hi all, i'm trying to recreate a bassline from the classic trance track "Transtar" by Transa. It comes in at 1:10. I've tried to recreate it but haven't even come close to getting that organic "growling" sound. It sounds like filter cutoff is being manipulated as the bassline is playing. Can anyone provide some pointers on this one? Cheers.