It sort of looks like it's not multitimbral which would make it of limited use for BIAB users. Some of the individual sounds do sound quite good so it would be a contender if it was multitimbral. I have an email into Sonivox support on this and will report back.

BTW: My current "One VST fits all" solution is Purity by Luxonix. I never hear this mentioned by BIAB users, but it works fine (other than a tendency to link the Bass and Piano, which is fixable). Sounds quite good for the rock/pop stuff I do. It's easy on resources and I think I paid roughly the same as what Sonivox is offering for SoundStage.