It doesn't convert usb to midi.Only for their devices.
And it cannot work as a midi through either.
So the only reason to buy this,is because you want to expand your Keith mcMillen product.
The problem is that this thing exists as an external piece of gear in the first place.Meaning that it should be built in.
So if you want for example to hook your Softstep 2 to a device that works with midi,you have no option,you need to spend extra 70 euros for this.
It is unreasonably pricey,and my first one stopped working for some reason.So i had to buy a second one.140 euros in total for something that should have been built in.
At least with such price,one expects some good sturdy quality.On the contrary,my first device started being slower sending midi commands until one day it stopped sending anything.
You can't avoid buying it though,sadly.Only thing you can do is avoid products that need it.
I am disapointed with the tactic of this company.
It's such a shame because they have great and innovative ideas,but the execution could be better.