Thank you.

Setup is elderly but straightforward: Windows 10, i7 processor, 64GB RAM, Soundblaster SBZ, latest BIAB build.

Turns out the ‘Select Custom Midi Style for this track’ element was a bit of a red herring in that the problem is apparent when selecting a style in the first place. Therefore in ‘Style’ if I clear all filters and then tick ‘Styles with Specific Midi Patch’ and select ‘Midi 41 Violin’, only around 1 in 10 of styles returned contains ‘41 Violin’, with the rest being ‘41 Brushes Kit’. Makes me wonder if BIAB is simply picking up on the ‘41’ part and ignoring what follows.