This uses the CASCADE IN/OUT ports, but is not a Cascade function. (MIX buses are not merged: you use the PATCH function to choose the required audio connections.)
Advantages:
Use DME for inserting extra GEQs, PEQs...
Use DME for extra effects units (send & return).
Control many of the DME functions from PM5D.
Patch any PM5D output to DME (including insert send and direct out).
Monitor DME audio channels from PM5D CUE bus.
Get 32 I/O between PM5D and DME at 96 kHz. (The CASCADE IN/OUT ports can work in 'DOUBLE SPEED' mode.)