Just a quick note:
The Instruō arbhar has an expander that comes included with the module (you don't have to buy it separately), it's another 2HP. It has 8 CV inputs and allows for CV control over all the remaining parameters not found on the main faceplate. Very useful.
https://www.modulargrid.net/e/instruo-arbhar-expander
https://www.instruomodular.com/product/arbhar/
https://www.instruomodular.com/wp-content/uploads/2019/12/Arbhar-Quickstart-Website.pdf