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Digi+ Pro Diagnostics

I've just started trying to get a Digi+ Pro to work and am having some difficulties. It would be useful if there was a series of steps to take in order to diagnose what the problem is.

My setup is a headless volumio installation with the digi+ pro connected to a DacMagic (optical but have also tried the coax). I've not been able to get any sound output and, on occasion, see the following error on the volumio web UI:

"Failed to open "alsa" [alsa]; Failed to open ALSA device "hw:1,0": No such file or directory".

(although not always so may be a red herring)

So far I've tried both a RPi2 and an RPi3 with same result, so fairly confident it's not the Pi.

Volumio forums seemed to indicate that setting the audio out pack to headphone jack, rebooting and then setting back to I2C might help but sadly that hasn't.

I initially fired the pi up on my desk and seem to recall seeing red light from the TosLink connector but I'm not certain of that. Since moving it to plug into the Dac & Hifi I've not seen that, so no longer certain if what I saw was really a red light or maybe just the Pi power LED. 

Searching the forums here lead to me to run "aplay -l" and the output there looks promising:

**** 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 1: sndrpihifiberry [snd_rpi_hifiberry_digi], device 0: HiFiBerry Digi+ Pro HiFi wm8804-spdif-0 []

  Subdevices: 1/1

  Subdevice #0: subdevice #0

 

Any tips for some diagnostic steps to follow much appreciated!

 

Thanks.

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