Orion comes with an advanced Arpeggiator integrated into it's sequencing system, which can be used for sequencing as well as for realtime performance, like the arpeggiators you would find on performance keyboards. The Arpeggiator creates melody lines from single notes and chords, using various predefined patterns. It has a large number of parameters you can play with, including a fully programmable autochord system.

It is often a great tool for inspirational experimentation, and if you come up with something good and decide you want to manually make changes to a few details, you can use the rendering feature, which will generate a non-realtime copy of the arp sequence into a pattern, as notes.