Thanks for this thread. I discovered the same problem with BandStand and BIAB on Snow Leopard, and now I'm glad that NI gave me a kick in the butt to learn something new.

Luckily, I recently acquired the latest Kontakt and Battery with an upgrade to NI Komplete 6. Battery has a nice GM drum kit, and a template that makes it easy to create your own. Kontakt can read the BandStand Library if you really prefer it, but the new Kontackt and Battery libraries are better quality.

I think you can get Kontackt Player for free, and do most of what is needed; I suppose it too will read the BandStand library.

The combination of RealTracks, RealDrums, RealSoloist, and then Kontackt and Battery for the vast library of midi that is not covered yet, is hard to believe. So soon old, and so late smart... I can barely contain myself.