Bc2000 (for the BCF2000 & BCR2000)

I am planning on using 2 BCF's and One BCR in Ableton. Using both the Bcf's in Mackie Mode I am stuck as to how to place the Faders on Unit 2 (id2) to operate faders 9-16? Planning on using the BCR in bc mode. I was using all 3 units in bc mode before but want to explore the Mackie mode on the BCF's only. Any help is always appreciated :) Richard :)