I'm wondering if it's possible to replace a USB hub and multiple cables with a single custom cable. Kind of a custom splitter cable of sorts. I have 3 midi controllers with the square type USB connector on one end that I want to combine into a single regular USB connector on the end that plugs into my MB Pro. This would simplify my setups, reduce connection points and reduce the likelihood of accidental disconnections (my current non-powered USB hub doesn't have the tightest sockets).

Does anyone know if it's possible to purchase USB cables like this and if so where? Thanks.