The Proteus uses both, MSB (bank on the DT) selects the ROM ID and LSB selects the bank of that ROM. You have to create an LSB (cc32) and p-lock it.

My Digitakt is dedicated to sequencing the p2k and it pairs up well apart from bank changes are a bit awkward due to DT only having MSB. The p2000 is basically identical apart from the Sequencer and extra 4 control knob functions and is just a single rack. Last Proteus I owned was a p2500 with extra roms which I loved but it took up a bit too much room in the end, although I always regretted selling it.

I’ve owned lots of E-MU gear over the decades and have serious fondness for them.