Thread: My Second Hand Rack Add/Delete?
I would replace nothing at the moment. I would make sure that I had plenty of patch cables, including splitters.
I would then spend a lot of time on Youtube learning the basics of modular synthesis as well as any tutorials or reviews of each individual module.
As far as I can tell, there isn't an internal sequencer that offers any pitch information. So you may be a bit limited. I would (I mean me) would buy something like the new Arturia Keystep Pro or equivalent with its own patchable sequencer. There is a MIDI to CV converter if you'd like to use your computer or MIDI sequencer... but I'm talking about the pure patch cable experience.
That would be my take on it.