Thanks a lot for your answer.
Connecting via USB could be the solution. Hope I can do this with my ipad as well as I want to take the H9 off the sends off my mixer and make it patchable from my Eurorack where an Ipad would be okish. I definitely give this a try if it doesnt work out I try to do the pots as well as the io including level matching on a diy module on stripboard and take it from there.
Thanks for helping 🙂
