Getting unwanted CC signal into the OP-z while using NTS-1

Hi there!

I’m scratching my head hard with this one.

I’m using the OP-Z to sequence a NTS-1 korg, which is FUN. And although I haven’t even mapped the CC chanels (or rather maped all to 1 trying to solve this issue) everytime I tweak the B knob on NTS-1 at the OSC page the OP-Z cycles through al the mixer groups, which sometimes interrupts my flow while playing.

I’ve tried disabling midi in and it STILL does it (how is this possible?), still I’d like to keep midi in anyway because I’m using an external keyboard.

Iirc the select mixer group channel is 55 and apparently thats the same value for that knob, so maybe changing the cc address of the mixer group would fix it for me, but I’ve checked the midi config file and I only see cc out parameters and not cc in.

Anybody has any Idea how I would go about this? Or more remotely how to disable midi out of the nts-1 through usb.

All is connected using a powered hub.