Ok, so I have a Presonus Audiobox USB and a keyboard with MIDI ins and outs. I have MIDI cables as well. I believe I have everything connected and installed correctly. SO when I go into external devices to try and add a keyboard, the only option under "Receive From" is 'None'. The Send To option has multiple options. Ive watched several videos, but none say what to do when you encounter this problem. I'll give best answer to whatever works. Also, ask for any more details if you need them.