Korg DW8000, Mono/Poly, MS-20...

I have a DW8000 with the angel city mod that seems to be acting 
strangely.  If I set the mode to any of the "Local Off" modes it does 
not respond to incoming MIDI messages.  

I checked with MIDI OX and with the synth in local off mode, it still 
transmits data as it should, but does not respond to incoming messages 
generated by MIDI OX or another synth.

This does not seem to be normal behavior for a local off mode, is this 
correct?  Any suggestions would be welcome

Thanks

DTK