If you already have a multichannel audio interface (8 channels) it will most likely have midi out on it also so all you will need is the breakout cable. See more info on it here:
But before going all out with the hex, try the regular version. Take any guitar with mono output, plug into your audio interface, into MG3 then go out with a midi cable into osmose. Even though it’s not HEX you can still send out MPE to osmose and if you couple it with lets say two USB expression pedals or a breath controller you will be surprised how much control you can get out of the osmose.