No Sound from Generic SA9023 USB DAC with RPI3

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1

I have a rpi3 running volumio version 0.928.

I have a Chinese made generic SA7023 based USB DAC. It’s got its own power. I think it is detected.

% dmesg
[  345.073231] usb 1-1.2: new full-speed USB device number 4 using dwc_otg
[  345.246276] usb 1-1.2: config 1 has an invalid interface number: 3 but max is 2
[  345.268550] usb 1-1.2: config 1 has an invalid interface number: 3 but max is 2
[  345.290807] usb 1-1.2: config 1 has an invalid interface number: 3 but max is 2
[  345.313075] usb 1-1.2: config 1 has an invalid interface number: 3 but max is 2
[  345.335329] usb 1-1.2: config 1 has no interface number 2
[  345.373163] usb 1-1.2: New USB device found, idVendor=262a, idProduct=1250
[  345.394103] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  345.416355] usb 1-1.2: Product: SA9023 USB Audio
[  345.430408] usb 1-1.2: Manufacturer: TRASAM USB 96KHz/24bit
[  345.468367] input: TRASAM USB 96KHz/24bit SA9023 USB Audio as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/0003:262A:1250.0001/input/input0
[  345.510773] hid-generic 0003:262A:1250.0001: input,hidraw0: USB HID v1.00 Device [TRASAM USB 96KHz/24bit SA9023 USB Audio] on usb-3f980000.usb-1.2/input0
[  345.619390] snd_usb_audio: unknown parameter 'nrpacks' ignored
[  345.637185] snd_usb_audio: unknown parameter 'nrpacks' ignored
[  345.685227] usbcore: registered new interface driver snd-usb-audio
volumio@volumio:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 5: Audio [SA9023 USB Audio], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 5: Audio [SA9023 USB Audio], device 1: USB Audio [USB Audio #1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
volumio@volumio:~$ cat /etc/mpd.conf
...
# Volumio MPD Configuration File
audio_output {
                type            "alsa"
                name            "alsa"
                device          "hw:5,0"
}
...

The problem is there is no sound playing any songs in a Spotify playlist or any CIFS/SMB mounted *.m4a files (from iTunes). However, I can hear the startup sound when Volumio boots.

How can I debug the problem?