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A couple examples to get you started with the Kickstart Kit (bundle), mostly keeping things simple, yet pushing the boundary just a tad here and there...
The Kickstart Kit is a core set of modules that could respectably comprise a modular rig in and of themselves. It includes what you’d need (to play a melody) and what you’d want (to go on a deep dive into modular exploration). For more information, check the kit's description page.