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Go to OPT>PREFS>COUNT-IN/MET>

There is a dropdown menu toward the bottom of the window. Notice that some of the choices say: "Visible Metronome." Experiment with these to see what they do.

Now go to any measure of a BiaB song and press F5. Notice that any of the voices can be muted.

HERE is my idea: Create your song in a such a way that the first 8 bars have all instruments muted AND the visible metronome counting away. You can start the BiaB song, then play your intro in time to the metronome. When BiaB get to bar 9 (or whatever you pick for the length of your intro) the instruments start to sound. Carry on playing along with BiaB for the rest of the song.

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Flatfoot sez: Call me when 'Talent-in-a-Box' is ready to ship! -- [8{>

Got some tunes on You Tube:
http://www.youtube.com/user/flatfoot50
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My BiaB lesson site:
http://jdwolfe0.wixsite.com/learnbiab