We both have an identical issue. The card is new, and tested OK with volumio, by just changing the micro sd card.. So not a hardware issue…
The order it was installed.
I was originally using Iqaudio dac, this was removed, Allo boss installed and booted. Installed plug in, then custom kernel. Card is selected in the Allo plug in page. In the audioplayer setting page, the hardware line, doesn’t look correct, no mention of Allo boss. Screen shot to follow when I’m home tonight. Squeeze player fails to open saying no hardware found. I really welcome your help as max2play is just so freaking awesome! Thanks in anticipation