--LA3500 Balanced Line Adapter for M3500/M3700:
Converts (8) group outs and (16) tape returns to +4db balanced line levels. Puts DB25 connector on console. Tape returns are grouped as two boards of eight each. 32 balanced ins can be had with (2)LA3500.

To break out to XLR connectors, need more items:
--Part#PW8DXF: DB25 to (8) Female XLR jacks.
--Part#PW8DXM: DB25 to (8) Male XLR jacks.
--Both these jack boards include 8 meter DB25 cable and cost of each is $95 dealer/$135 retail.