The Doepfer A-188-1 4096 was one of my first modules, a decade ago. I found tracking the clock noise with a LPF nearly impossible, though I could dial it out for a patch without any further knob-twiddling.
One interesting thing about the Doepfer BBDs is that you can buy ICs from 128-4096 stages for a couple bucks each and swap them in and out with minimal calibration.
But that clock noise, urgh.