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For example, I'm using JAZFRED Style


Thought I had everything, but I don't have JAZFRED?? Is this a midi style?

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What do I not understand ...



First thing to understand, you can not easily get exact note-for-note arrangements in BIAB. It will play an accompaniment but not necessarily the exact notes you may want. Are you working with Midi or RT bass? RT bass will only play what is recorded and does not follow any Style file.

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and how can I achieve what I want?



To get a exact arrangement in BIAB you can create the bass line (either by manual notation entry or play it from your keyboard) or edit the midi content in the notation window. Then be sure to freeze the track.