Thanks for the replies about Sforzando
I am a mac user on Sierra.
Do I need to modify the ".xml" file in
/Library/Application Support/PG Music Inc/Band-in-a-Box Sounds.bank.xml?

I will only quote the first instrument in the list,
What I have is as follows:

<AriaBank id="2050" name="Band-in-a-Box Sounds" vendor="PG Music Inc" product="Band-in-a-Box Sounds" version="1000" cc7_support="1" cc10_support="1">

<!-- <Define name="$sample_dir" value="../Samples"/> -->

<AriaGUI path="GUI/bb_info.xml" target="*ARIA_INFO" />

<!-- Bass -->
<AriaProgram name="Bass/61 Classic Bass" gui="GUI/Generic.xml"> <AriaElement path="Programs/Bass/61 Classic Bass.sfz"/> </AriaProgram>

What about the AriaElement path?
Thanks for clarification
Dan