Hi,
What do you expect for the next BBO libraries, now that most of the sound families have been covered?
As for me, I would love there were still some extended techniques, like in Black Eye and Fornax, exploiting the special acoustic of the Synchron Stage. Extremely soft sounds reverberated by the hall; sound bursts resounding; sul tasto, sul ponticello and harmonic sounds made rich and fat by the surround take.
And then scraped percussions or strings, ricochets, fast arpeggios, multiphonics, breath through brass. And chamber strings ensembles, with a delicate, yet "big, long resounding" sound.
Innovative sounds taking advantage of the unique ambience, not so commonly used in classical literature, but useful for more contemporary styles.
Paolo