My input has stopped working on the stereo card, so I dug deeper and found out aplay -l gives this. 

card 2: audioinjectorpi [audioinjector-pi-soundcard], device 0: AudioInjector audio wm8731-hifi-0 [AudioInjector audio wm8731-hifi-0]

  Subdevices: 0/1

  Subdevice #0: subdevice #0

Instead of Subdevices: 1/1 it is 0/1

I am a noob so apologies for the silly Question.

Regards,

Z