Alright so I've been working in Garageband for about a month and have made a few tracks, but I've just come across a problem that I have yet to encounter, and I can't find anything about it online. When I was playing on the keyboard, I accidentally hit some keys, I'm not sure which ones, wherein lies the problem, but it made the whole keyboard turn to a faded grey and then I was unable to play on it anymore. I can still see it but I can do nothing. I opened and closed the program but the keyboard is still like that. It seems to me that I just need to hit something to fix it, but I have no idea what that is. There is nothing in product support about it or anything in forums. Any help would be appreciated.