I am considering buying a Casio PX160, which only has a MIDI via USB type of connector, and I want to control other keyboards (with standard DIN-style MIDI IN) off the PX160. I have only found connectors/adapters that allow ordinary DIN-style MIDI OUT connectors to be converted to USB so those DIN-style keyboards can easily get into the computer. I don't need to get such conventional keyboards into the computer; instead, I just want to be able to control other conventional keyboards off of a keyboard (e.g., the PX160) that has the USB connector. And, I don't want to have to use or bring a Focusrite or the like, much less a computer. Can anyone tell me if such a thing already exists? Or, would anyone be interested in building such a thing, and/or even productizing it? It seems to me that there would be quite a demand for such a simple connector/adapter. I have brought several products to market, from conception through prototyping through offshore manufacturing through marketing, so I would certainly be able to help on that side of things. Can anyone help?