Yah, filters.
I guess I've never been a
real "synth guy" because I've never waxed romantic about filters.
This'll sound like heresy, but Moog filters never seemed particularly special to me. They were steeper than most, and responsible for the classic Moog sound. But while 24dB/octave filters were rare in the 70's, and the Moog filter was an elegant design, such filters are not at all difficult to implement in the digital domain. I would expect one 4-pole LPF to sound pretty much like the next. Unless, of course, I'm wrong about that.