I am talking about the window in the meter bridge on the right side just under the Mackie logo. I am trying to determine if your console is seeing clock signal. If it is not, you aren't going to hear audio. You should be able to pick up the embedded signal on the optical/light pipe signal.
Edit: Just found this, also posted on your other thread....
Posted: Tue Dec 17, 2013 9:48 am
I just found this on the Mackie site. This could be your issue.
Can the DIO-8 card derive word clock from the light pipe input?
No. Like the OPT-8 card, the DIO-8 cannot derive word clock from the light pipe input. I thought at some point a long time ago I got this to work but I am guessing my memory is wrong on this one.
You can find more info. here:
http://www.mackie.com/support/FAQ/d8b_d ... .html#adat