BCL can't read multiple parameters and output a composite value.
If two controls output the same Midi like a CC 07 message then they stay in sync, but you can't read and add.
This would be great for older synths that pack their data into single bytes to save memory.
The only way to do this is by having a computer in the middle to pack and unpack the data.
(see BCR<=>DW6k
this packs and unpacks the data from a Korg DW6000)
Looks like Behringer will miss out on a sale.
All the best
Royce