To answer a few questions:
Yes BB can now record audio in a track.... BUT.... In Real Band, (which comes with it and where you render the Real Tracks) you have a fully functional multitrack DAW. On a conversation with BB support, the guy asked why I wasn't using RB's DAW. I liked MC4 better.
I finally found a singer who seems to be willing to work with me... a friend of my daughter who has a really good voice.
Don't let the interface in BB fool you. It looks basic and it is, which makes it easy to work with, but the real magic happens when you open that basic sketch in Real Band and replace all the tracks with the Real Instrument tracks that are available there. Sometimes I have to render a track 3 or 4 times to get something useful, or simply to find one that sounds good and fits the groove of the song.
Screw the reviews.... listen to the work people here (including myself) are doing using BB. Let that help you decide.
BB has the ability to "create a song" for you, BUT.... that is basically a computer throwing chords together in commonly accepted forms.... It is so much more useful when YOU set down at a piano, or with a guitar and start working on a new idea...and then use BB to capture that idea and put it into a repeatable form. Using the "record audio" function in BB you can also record and save your melody line.
I do not use the record audio function, choosing instead to capture the chords and play with the song structure and develop it in BB while "writing the melody" in my head....and if it's a strong melody and groove, I will remember it the next day. If not..... it wasn't a strong idea and I will write a new melody.