https://bugs.freedesktop.org/show_bug.cgi?id=87656

--- Comment #19 from Raymond <[email protected]> ---
(In reply to Owen Williams from comment #18)
> I am having trouble testing the front and surround devices with aplay
> because I always get the error: aplay: set_params:1233: Sample format non
> available
> Available formats:
> - S32_LE
> 
> 
> And none of those devices show up in pavucontrol, either.

this look like alsa bug/limitation 

you have to define customised front, suuround40, .. for your traktor audio10

need plug:front if your card does not support s16_le


USB-Audio.pcm.front.0 {
    @args [ CARD ]
    @args.CARD {
        type string
    }

        type route
        ttable.0.0 1
        ttable.1.1 1
        slave.pcm {
            type hw
            card $CARD
        }
        slave.channels 10

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