Need the actual PG techno geeks (programmers) to weigh in here and for the record my explanation is not official or final but from my use/research

The BIAB Hi-Q sounds are built in ST2 format; hence, nothing more than high quality ST2 sample sets/ sounds. Moving them into ST 3 will not improve them and they won't be "automagcially" called up by BIAB using ST3: even with Jbridge installed.

BIAB calls up ST2 synth to play the Hi-Q sounds, as a matter of fact BIAB calls up the DXi version of ST2 (automatically) not the VSTi version no matter what default plug-in VSTi/DXi synth is listed as your default in your plug-ins in pull down (e.g., TTS-1, Dim Pro, Kontact, Forte DXi, Garritan) or in "Opt.>MIDI/Audio Drivers Settings," and no matter what VSTi/DXi synth you already have selected for a that given track. That is, as soon as you change a tracks patch to a Hi-Q patch the synth for that track gets changed to ST2 DXi.

Now, if you simply want to USE the BIAB HI-Q samples in ST3 import them using the "Import Legacy Instruments" function - then simply point to the parent folder "Band-in-a-box" that contains (bass, Drums, Guitar, Piano, Strings, Synth and World sub folders (i.e., where you installed the HI-Q 1 and 2 sounds)

I keep ALL IK Multimedia samples/instruments (ST2 and ST3, Miro, and BIAB sounds, and Sampletron and, Sonik Synth, etc. ) under same PARENT directory makes finding stuff so much easier.

Good Luck
Larry

Win10Pro,i9,64GB,2TBSSD+20TBHDDs,1080TI,BIAB'24,Scarlett18i8,Montage7,Fusion 8HD,QS8,Integra7,XV5080,QSR,SC-8850,SPLAT,FL21&others,Komp.14,IK suite&others, just a guitar player-AXE FX III &FM9T, FishmanTP, MIDIGuitar2, GK2/3'sw/GI20