Hi Paul
Like Flatfoot says, are you looking for a way to create string sections with what is already delivered with BiaB, perhaps using your internal sound card, or are you looking for an external package (software or hardware synth) that BiaB can use to create 'quality sounding' Orchestral Strings?

There are several string sounds on an internal midi synth that 'sort-of' do the job. The product you referred to at sounds online will most probably give you far more realistic results, but may take a bit of input effort (I'm guessing those samples didn't just 'happen'). I don't know how compatible it is with BiaB, but note that it is dongle-protected software, so you also need to purchase an i-Lock if you don't already have one.

If this is the direction you are heading, make sure you take advice from Guitar Hacker and look at the Native Instrument strings as well as the Garritan package.

BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones