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Hi grandmusik

This is because 16 of the 64 inputs available from the Master Port B ACE card are used up by the 16 analogue inputs on the xDR-16, leaving 48 that can be taken from the xDR-16 Port B. On the outputs side, the same signal can go to multiple outputs, so the 64 Master Port B ACE outputs are all sent to the xDR-16 Port B slot. Eight of these 64 will overlap with the 8 XLR outputs on the xDR-16.

Hope that helps.

– Jeff, A&H