Yes, Sforzando is necessary for Band-in-a-Box. Most of the interaction between Band-in-a-Box and the sforzando synth will be behind-the-scenes, so most users do not select sforzando directly in their workflow. Just "pick a style and press play" as usual. This is because the styles that need to use the synth are coded to do so in the style, using the Hi-Q patch.

You can re-install sforzando by running the installer for your main band-in-a-Box/RealBand. You will get to this screen where you can make sure that Plogue is checked.

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Best,
Chantelle