Hi Jim,
Thank you for your input, very much appreciated!
Instruo is indeed available in VCV, so I was already thinking of changing them. Good idea of having more (flexible) VCO's and Sequencer, also the Minibrute 2S has a sequencer and two VCO's. But I'm not sure if the sequencer can be used for the external VCO's. I doubt if they can. The difficulty for me is having the idea to both have a stand alone hardware modular system and a system that is enhanced by VCV. That is why I chose es9 to be able to have more connections with VCV.
The black output module could get a smaller alternative, but balanced out and phone out would be nice ;-).
Back to the drawing board... :-)