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No sound output with digi+ in combi with Pi4B

Hi,

i bought my first digi+ card to be used on a pi4b.

I installed the hardware. Enabled the extra line in config.txt.

in aplay -l I see the device:

**** List of PLAYBACK Hardware Devices ****
card 0: vc4hdmi0 [vc4-hdmi-0], device 0: MAI PCM i2s-hifi-0 [MAI PCM i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: vc4hdmi1 [vc4-hdmi-1], device 0: MAI PCM i2s-hifi-0 [MAI PCM i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
  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 3: sndrpihifiberry [snd_rpi_hifiberry_digi], device 0: HifiBerry Digi HiFi wm8804-spdif-0 [HifiBerry Digi HiFi wm8804-spdif-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

but i get no audio. for example: When i do:

aplay -D sysdefault:CARD=sndrpihifiberry -vv Fanfare60.wav

i do see a red dot at the end of the cable. My digital amplifier also notices a PCM signal, but there is no output.

I tried both an  optical cable as well as the coax cable. 

I know the cables and the  amplifier are working fine, cause with other digital audio sources i get output.

What can i do to fix?

 

 

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