Get started with Volca Keys - your first five minutes 

I second that

Me too

Yup!

USB hub?

You could use a Kenton USB Host box. An iPhone, Lightning to USB dongle, USB MIDI interface, and a USB hub would work too. You’d need an app-like AUM-to set up the MIDI routing.

Keep dreaming

That’s all we can do my friend I ended up just buyin a 8 channel mixer from another brand to take the volcas I have but it would be nice if korg done a great little mixer For the volcas

It would have been perfect and it would have sold as warm bread, but it is difficult to understand how they are reasoning

Buy a vmix10. But if you open the volca mix you'll notice it's a very dense piece of electronics. I think it's underestimated how complex it is.