Yes, Dan... either the computer is clocked by the arranger (better, really, because the arranger stores the tempos for songs in their registrations) or the other way around.

Chord sequencer is a LIVE tool. You don't put the chords in in advance, it simply sees the NTA you just played, then loops them until you tell it to go on. It's an amazing tool for the two handed player (or multi-instrumentalist).

It is a feature that many older Roland players used to like, and soon, many Korg players will start to realize how powerful it is.

TBH, it's a fairly simple program, far easier than the vArranger to write, perhaps you and I can correspond privately about it?