I go along with the idea that with vst support PG has already solved the problem. I have Garratans personal orchestra and with use of the controls can come up with great sounding strings. If I wanted to speed more I could get the Vienna Orchs. Same with the horns. You can get great sounds from Garratans Jazz Band set or spend chunks of $ and get perfect horns with total control from the same folks that do the Vienna Orchestra.
I haven't personally quite figured out to get the vst stuff working yet but once I do I am really looking toward using my Korg M1, Yamaha FX7, NI's B3 the Superior Drummer Drum sets ect in BIAB. They sound super in ProTools and Sonar so they should sound the same with BIAB but with all of the super features of BIAB

Dell 610 dual Monitor, win 7-10, Sonar Plat, ProTools 10 & 11, Reaper 4, BIAB/real Band 2022, Easy Drummer, Superior Drummer, Kontact Essentials, Personnel Orchestra, Korg Legacy Analog & Digital