Ol' Drex, hm? Well, lessee...
Amazingly enough, Drexciya (and some other Detroit producers from the same general period of time; Derrick May comes to mind immediately) actually used a good chunk of DIGITAL synths. One ubiquitous one would have to be the 4-op Yamaha FM synths, with the DX100 being popular there due to the ease of transport. The Korg M1 is also in there, too, as well as Casio's CZ-101.
When putting together Detroit-style tracks, it's important to remember that that scene utilized loads of "we pay you"-grade pawnshop and used gear due to the cheapness and ease of obtainability up into the mid-1990s. You see a similar situation in the Chicago scene as well, which is how the TB-303 wound up being a desirable track. When Larry Heard cooked up "Washing Machine" in 1987 with that little box, it succeeded because he used it "wrong"...not as a bass source, but for all of that squelching and weirdness, and this was still during the tail-end of the period where the TB-303 was considered to be Roland's most massive mistake up to that point.