I use aplay -vv [audiofile].wav and it works great through the 3.5 mm jack on the card. (The setup for this card was very easy and I am very happy with it so far!)
However, the analog knobs don't seem to do anything, and I haven't been able to get any sound through the RCA outputs. (I'm not sure if the RCA inputs work, because I haven't tried to use them yet).
I used the "alsactl --file /usr/share/doc/audioInjector/asound.state.RCA.thru.test restore" command from the how to setup and test post to set up the RCA ports, is there further setup required? Is my card damaged?
Here is some output from dmesg:
[ 3.257811] audioinjector-stereo soc
ASoC: CPU DAI (null) not registered - will retry[ 3.257830] audioinjector-stereo soc
snd_soc_register_card failed (-517)[ 3.259415] audioinjector-stereo soc
ASoC: CODEC DAI wm8731-hifi not registered - will retry[ 3.259445] audioinjector-stereo soc
snd_soc_register_card failed (-517)[ 3.436626] audioinjector-stereo soc
ASoC: CODEC DAI wm8731-hifi not registered - will retry[ 3.436645] audioinjector-stereo soc
snd_soc_register_card failed (-517)also,
[ 32.237140] bcm2835-i2s 3f203000.i2s: I2S SYNC error!
[ 55.671984] random: crng init done
[ 81.946592] bcm2835-i2s 3f203000.i2s: I2S SYNC error!