I have almost the exact system except its the dm-3200 and a motu 2408mk3....
Motu is the master and dm-3200 is the slave....I have a clock sync set-up from motu to the dm-3200...
I am using 3 tdif cords also....I run 48k 24 bit and have sonar, motu set for that...I am running asio drivers and the dm-3200 is the controller....so slide a fader on the board, corresponding one moves in sonar....
You need to have a usb cable to the computer and a usb port available to do this...
You should be able to rock with this setup....
Call me over the weekend...I will get on my system and walk you through setting all the in's and outs....
My studio # is (202) 299-8573....
If I can help, cool, if not, have a great weekend!!!
Peace!!
StudioCat57