Question:

What's the difference between the dual MADI card and the MADI/USB card?

Answer:

The dual MADI card has capability of 64 by 64 MADI channels in and out.  The MADI /USB card has 32 MADI channels in and out but also has 32 channels of USB2 in and out available for record out or to bring signal from a digital device in and out.