As per your example, you need to use multistyle feature of BIAB to be able to play 4 parts : parts A, B, C & D. Multistyles were added in 2008 version. A multistyle can have up to 24 substyles. That is the way to go, if you want to get high level quality arrangements. Standard styles have only 2 substyles (part A and part B).
You can easily make your own Multistyles by combining parts from existing styles.


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