[Alsa-user] Edirol UA-1EX help needed

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All,

  Bought this device, due to the recommendation that it was complete
supported.  I plugged it and it worked.  That's great.  However, I want
to use the spdif output.   I am either at a configuration issue or lack
of understanding.

This works and comes out the analog RCA:

aplay -D default sound.wav

aplay -L shows me this:

default:CARD=UA1EX

    UA-1EX, USB Audio

    Default Audio Device

front:CARD=UA1EX,DEV=0

    UA-1EX, USB Audio

    Front speakers

surround40:CARD=UA1EX,DEV=0

    UA-1EX, USB Audio

    4.0 Surround output to Front and Rear speakers

surround41:CARD=UA1EX,DEV=0

    UA-1EX, USB Audio

    4.1 Surround output to Front, Rear and Subwoofer speakers

surround50:CARD=UA1EX,DEV=0

    UA-1EX, USB Audio

    5.0 Surround output to Front, Center and Rear speakers

surround51:CARD=UA1EX,DEV=0

    UA-1EX, USB Audio

    5.1 Surround output to Front, Center, Rear and Subwoofer speakers

surround71:CARD=UA1EX,DEV=0

    UA-1EX, USB Audio

    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers

iec958:CARD=UA1EX,DEV=0

    UA-1EX, USB Audio

    IEC958 (S/PDIF) Digital Audio Output

null

    Discard all samples (playback) or generate zero samples (capture)

If I try to put anything out iec958 (aplay -D iec958) I receive this
error:

aplay: set_params:954: Sample format non available

I really do not have an asound.conf or .asoundrc.

I've messed with a few for awhile, but I don't seem to be able to do
anything with them.

Looking for some advice.  I'm ultimately trying to accomplish ALL sounds
to go out the spdif, and reading a Myth wiki on this.

However, I can't even get to the point I can verify spdif.

Thanks