Bc2000 (for the BCF2000 & BCR2000)

I'm working on an open-source application that involves using sliders
to control data parameters (for 3D visualization).  I want to use a
control board, namely the BCF2000 to provide a hardware interface for
the sliders that appearin the software.  Before I go out and buy one
of these, I was wondering if/how I would be able to interface with the
BCF in my software, which is written in C++.  Ideally, I want a
cross-platform solution, but will settle for being able to do this in
Mac OS X. Any help would be appreciated!