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Hi,

I have a very similiar configuration (Dayner with 24 inline channels
and a MOTU HD 192).
I bought the console last month, and started now doing the connections
to the MOTU.

here are some of my experiences regarding question #1:

IMHO you can't do "symmetrical" connections between the MOTU and the
Dayner without encounting some strange behaviours.

My first connection "trial" for the outputs on the MOTU was the
following:
MOTU XLR pin 1 (ground) - cable shield, not connected to the stereo
jack on Dayner (to avoid ground loops)
MOTU XLR pin 2 (hot) - ring stereo jack on Dayner (+4 dBu)
MOTU XLR pin 3 (cold) - sleeve stereo jack on Dayner (audio ground on
Dayner)
What happened was that I had a low level signal from the MOTU on the
monitors with even all mute switches activated!
I can only explain this that the signal from pin 3 on the MOTU was in
some kind modulating the audio ground of the console.

So I did the following:
MOTU XLR pin 1 (ground) - cable shield, again not connected to the
stereo jack on Dayner + sleeve stereo jack on Dayner (audio ground on
Dayner)
MOTU XLR pin 2 (hot) - ring stereo jack on Dayner
MOTU XLR pin 3 (cold) - not connected
and everything worked as expected.

You have of course to do an identical connection scheme for the inputs
on the MOTU to have the in- and outcoming levels the same.

Hope this helps,

kind regards,

Pierre