post the pulseaudio verbose log

https://wiki.ubuntu.com/PulseAudio/Log

you will notice that pulseaudio Probe the sound card by open devices
front,...., IEC958 for both playback and capture

but the Audigy2.conf have lock on the controls and those playback route
only used by playback device

you need asym plugin to put those hooks plugin into playback slave of
asym plugin

not sure what controls need for iec958 capture device ?

Audigy2.pcm.iec958.0 {
        @args [ CARD AES0 AES1 AES2 AES3 ]
        @args.CARD {
                type string
        }
        @args.AES0 {
                type integer
        }
        @args.AES1 {
                type integer
        }
        @args.AES2 {
                type integer
        }
        @args.AES3 {
                type integer
        }
        type hooks
        slave.pcm {
                type hw
                card $CARD
        }

        hooks.0 {
                type ctl_elems
                hook_args [
                        {
                                interface PCM
                                name "IEC958 Playback Default"
                                preserve true
                                optional true
                                value [ $AES0 $AES1 $AES2 $AES3 ]
                        }
                        {
                                # for compatibility with older drivers
                                name "IEC958 Playback Default"
                                preserve true
                                optional true
                                value [ $AES0 $AES1 $AES2 $AES3 ]
                        }
                        {
                                name "IEC958 Optical Raw Playback Switch"
                                lock true
                                preserve true
                                value [ 1 1 ]
                        }
                        {
                                interface PCM
                                name "EMU10K1 PCM Send Volume"
                                index { @func private_pcm_subdevice }
                                lock true
                                optional true
                                value [ 255 255 0 0 0 0 0 0  255 0 0 0 0 0 0 0  
0 255 0 0 0 0 0 0 ]
                        }
                        {
                                # for compatibility with older drivers
                                name "EMU10K1 PCM Send Volume"
                                index { @func private_pcm_subdevice }
                                lock true
                                optional true
                                value [ 255 255 0 0 0 0 0 0  255 0 0 0 0 0 0 0  
0 255 0 0 0 0 0 0 ]
                        }
                        {
                                interface PCM
                                name "EMU10K1 PCM Send Routing"
                                index { @func private_pcm_subdevice }
                                lock true
                                optional true
                                value [ 20 21 0 0 0 0 0 0  20 21 0 0 0 0 0 0   
20 21 0 0 0 0 0 0 ]
                        }
                        {
                                # for compatibility with older drivers
                                name "EMU10K1 PCM Send Routing"
                                index { @func private_pcm_subdevice }
                                lock true
                                optional true
                                value [ 20 21 0 0 0 0 0 0  20 21 0 0 0 0 0 0   
20 21 0 0 0 0 0 0 ]
                        }
                        {
                                name "Audigy Analog/Digital Output Jack"
                                lock true
                                preserve true
                                value 1
                        }
                ]
        }
}

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https://bugs.launchpad.net/bugs/1329014

Title:
  [Audigy2 - SB Audigy 2 [SB0240], playback] No sound at all

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