yes, unfortunately the one in the video ain't free. and for a routined sfx maker maybe piece of cake but for starters it's indeed overwelming and hard to understand what's happening. I had a look at triple osc of LMMS but it's kind of limited. I guess you need to add a lot of additional effect filte...
thanks for the hint on the detroit chord.
a search on you tube brought this in sight
https://www.youtube.com/watch?v=BeteyxeH4Hg
which seems quite close but what an amount of parameters that thing has