Getting M-Audio Delta 66 working

[Dennis Neumeier]

I just noticed something a little bit strange. I booted into my Windows just 
to see if the soundcard is working there. And when I look into the settings, 
I did see the following:

- Windows is using the device "S/PDIF" Output from the Delta 66 as standard 
output device.

- in the M-Audio mixer, the settings are as follows:
SPDIF-Output-source: "sw rtn"
1/2 out: Mixer

I noticed that when I am changing the output of "spdif out" to "mixer", I have 
quite the same situation as under Linux: I can see the level-meters of "spdif 
out" and the "master" moving, but no output. This only changes when I 
set "spdif out" to "sw rtn" and "1/2 out" to "mixer"

Now the problem: I can´t really transfer "sw rtn" onto my Linux system, 
because we have other names for that here. But perhaps this helps to find the 
cause? So is there any way to configure this under Linux? I am quite confused 
now, because the terms are different in both OS. Perhaps somebody can help 
here and clear up the fog of terms?

Regards,
Dennis