This sequencer for the Korg MS20 also works with Scope synths with trigger inputs.

Logiquencer allows to combine LFOs to create all type vintage sequences by controlling the Cutoff; VCA, or envelope triggers.

With the Korg MS20, connect the output of Logiquencer to the input of the Extrenal Signal follower, and put the triggers values at 50% approximately (you can fine tune those values to your linking).  Then route to the Lowpass Cutoff and/or Envelope trigger. The lowpass cutoff will include variations in cutoff in addition to the rythmic sequence.