I have rebooted and restarted the radio several times and now I can't get it working (same problem as the original post).
I don't have the HDMI connected, but I was using VNC. ?I disabled the VNC interface in the Raspberry Pi configuration, but aplay is still showing the vc4-hdmi-0 and vc4-hdmi-1 interfaces. ?How can I turn those off?
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73,
Mark, N8ME
Mark Erbaugh