Some voice databases include the same set of samples recorded at different voice registers.
Each set of samples is referred to as a sub-library and is assigned a unique name.
For these databases, Synthesizer V automatically switches between sub-libraries by matching the pitch of a note to the most suitable sub-library.
The mapping can be overwritten by specifying the sub-library for each note or for a selection of notes.
Use Edit Sub-library... command by right-clicking the selection.
Then choose from the options.
The sub-library for each note will then be displayed under it.