Ok, what i didn't realize is that your SD40 has multiple USB type A ports, so it can be a "host." Your controllers think that it's a computer!

I know that many arrangers made after Y2K have a USB type A port to accept a "thumb drive" (for external styles, songs, etc.) But that doesn't mean these ports can also host an external keyboard controller.

So my question... are there any other modules or arranger keyboards that will support these lightweight USB-midi keyboard controllers, or is Ketron unique in this regard? Thanks!!