Hi and welcome to Arturia forums.
You can build continous running sequences. You can for example build the sequences in a way where "Start" can be and is triggered by a running clock. Also the notes played is a concern if it depend on a speciel note.
There are different ways to build sequences. One thing that work for one build might not work for another. So i think it's best if you study how ARP 2600 and the sequencer works.
But i doubt you will keep the beat totally steady when you change presets, if that's what you are wanting to do. I hav'nt tried though. You can try.
I think perhaps i would use multiple instances of Arp 2600 - more that one instance.
