Mp 
As well you can use the Digital out of the BCD-1 to your BDA-1 
If I were you I would Go from BCD-1 Digital  out AES-EBU to your BDA-1 
It's a single balanced Digital Cable. I purchased all of my Cables from Bryston.
If you could get a hold of James that would be your best bet. 
Check what cables you are missing and Order. As short as possible is better
Enjoy 
Does it get any Better 
Robert