Bc2000 (for the BCF2000 & BCR2000)

Hi, I'm new here.

Wondering if there's any other Acid Pro users here.  I just purchased
a pair of BCF2000's and am trying to figure out the best way to
configure them for using as a mixing counsel for Acid Pro.  I've
successfully got them working in the Mackie Emulation modes, that is,
with one BCF hooked up I can scroll through any number of tracks using
the preset buttons (1-8, 9-16, 17-14, 25-32, etc). With two BCF's
hooked up I added the second BFC via the Mackie Expansion module in
Acid preferences mode.  So with two going I have 16 simultaneous
channels available.  What I can't figure out is how to expand the
channels with two BCF's hooked up in Mackie Mode.  For instance I'd
like the second unit to also be able to control channels 17-24, etc.
if needed.

Is there any better way to achieve this?  

Thanks in advance.

-Steve