For the Pettinhouse sequencer, essentially, you tell it how many steps you want in the step sequencer (from 1 to 32) and then you tell it the rate you wish to go through the steps of sequence (with choices of: 1/128, 1/64, 1/32, 1/16T, 3/64, 1/16, 1/8 T, 3/32, 1/8, 1/4 T, 3/16, 1/4, 1/2 T, 3/8, 1/2, 3/4, 4/4, Bar).
You also have a swing control.
The .nki has 25 preset slots for the sequencer and you can MIDI map the knob. Each preset can have different settings for the sequencer, so with that you could likely do some pretty unusual time signatures by switching sequencer patterns although I haven't put it through the paces myself.