Hmm, interesting. I've understood (assumed) that the various adaptors USB/Midi are all, in effect, Midi --> USB and they may well NOT work the other way. But, thinking about it, I'm pretty sure that at least some of the adaptors have midi IN and OUT plugs which would indicate that they CAN work the other way, Make sure any one you get has IN and OUT midi plugs! Then it OUGHT to be Midi <--> USB
Sorry, I wasn't clear.
The USB keyboard would need to be connected to a computer with a standard USB cable.
The sound module would need to be connected to the same computer using a MIDI to USB adapter.
Software on the computer can then route incoming messages from the keyboard to the sound module.