Musical typing not opening on Garageband
So I have a MacBook Pro Early 2011.
In Garageband, I'm in Songwriting. I want to record piano, so I wanted to use the musical keyboard. I went to window > musical keyboard. The keyboard came up, but it was greyed out and didn't let me type the letters or click on them.
Can someone help me? Thanks so much!
--Abigail
GarageBand (Mac) '11, OS X Mountain Lion (10.8.2)