LOGIC PRO 8 with motu 828mkII audio interface

Question

I have bought a MOTU 828mkII Firewire and I am using it with a Mac Pro Intel
dual core v. 10.4.10 running Logic Pro 8.
My mixer is a Yamaha DM-1000. I have a problem with audio.
I have the mac going into the 828 via a firewire cable, then out of the 828 to
the mixer using 8 channel adat lightpipe. All devices have the same 48k sampling
rate but I can not hear a logic virtual instrument, like a piano, using the adat
lightpipe interface. If I use the analog "main outs" on the 828 I have audio,
but nothing comes thru the adat output. If I use another application besides Logic with the same setup, the adat connection works fine. This leads me to think the problem has to be in Logic and how it interfaces with the Motu 828mkII. I have read all manuals and can't figure
out what's wrong. Any suggestions?
Thank you,
Pierre.

Answer 1

Generally, outputs on audio interfaces are discreetly named. So, if your master output is set to Output 1&2, that might refer to your analog outputs. If you want to send the a different set outputs, say, a stereo pair via ADAT, you might need to send to outputs 5&6, instead of 1&2.