Agree with what silent k is saying. It’s not worth the extra cables, space and hassle. For close to the same cost you could get the prophet 08. I ended up upgrading to a rev2. Take 5 is good too.
I’ve owned the mopho se, tetra and the mopho desktop and one thing they all had in common was a strange unpleasant bit reduction noise in the background. Once I heard it, I could never un-hear it. Not sure if the x4 had the same issue.