As Accent hinted above, the closest you can get to this with the MD is to edit a song that’s playing while in Song Mode.
Otherwise, as a vaguely-related alternative, you could put the elements of two patterns into one pattern and then mute one or other set of tracks.
Or get two MDs.[/quote]
Yeah you’re going to need to dive into Song mode for this. Arrange the patterns how you want with offsets etc then nest this sequence in an infinite loop. Once its time to move on then just exit Song mode or select the next line in Song mode after your loop command.