Here’s the KILLER sequencer feature folks:
Individual step length
Each step has a step length parameter which is the number of 16th notes until the sequencer advances to the next step. This allows one to make long patterns (longer than the Digitakt’s 4 bars), without loosing timing resolution (with the Digitakt, a long pattern reduces the step resolution to at least 8th notes).
Few step sequencers have this. One that I know of is the Orthogonal Devices ER-101 (http://www.orthogonaldevices.com/er-101) which is rather hard to get ahold of right now. If you want to see what can be done with it, check out Colin Benders’ YouTube channel: https://www.youtube.com/channel/UCx74vAHCehhLOeQNwbJcGyQ