Anthony, give us some feedback if this is helping.

I was going to add to #3, and I see Mario and Herb have done so. Another way to talk about virtual instruments is that, for me it's not relevant as I do not use BIAB as my DAW. BIAB has many DAW-like features, and comes with the free RealBand if you have Windows; RealBand is a simpler DAW with a major advantage that it reads native BIAB files. [So does MuseScore 3 notation, by the way.] But I prefer to compose in BIAB and then move the MIDI or audio tracks to a DAW for finishing. So I do not use any VSTi sounds in BIAB; I use my Roland hardware MIDI synth. But, you could; I just cannot comment because I've never done it. Hope that clarifies.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.