Oxi Split questions

I am still a noobie especially when it comes to hardware connections. I have pre ordered oxi one mk2 and am wondering if oxi split is necessary. I want to be able to sequence my synths with oxi by recording while playing on my synth. Currently i am using cme h4midi and i have my synths midi going in and out from digitakt’s sequencer. Is that possible with oxi split?

Is oxi split necessary when i have cme h4midi?

And what does”It increases data transfer capacity and the number of MIDI channels up to 96.” mean which is found on the website?

Sorry for asking :( ill give back to the community as i grow