MADI use to only be 56 channels, not a problem with 3348 or D827s
64 is a bump that only happened in the last 5 years or so
maybe a few of this Sydec box and a MADI hub
http://www.sydec.be/Products/Details...Box+64-MADI-T/
or convince them to roll what you need 8 TDIF by 1 MADI