All I mean with the MIDI keyboard is that the Real Time input is bad, which is playing while Notion is trying to notate while you play. You can still hit an E key on the keyboard and it will input the note fine, its just the real time that isn't all that great. As far as I know, you can't use GPO or anything like that, but I think Notion's playback is fine...you can listen to mypieces on this site, they are all done with just Notion and its playback. Best of luck!
Vince