From: bulleid@ku.gro.lioff   
      
   Pi3 running Bookworm.   
      
   I have a python program that runs continuously, that will when it   
   detects an event call aplay to play a short tune.   
      
   This has been working fine, until today.  I had to reboot the Pi earlier   
   today, and now the python won't play aplay (the python is running as it   
   logs when the event happens).   
      
   If I do a cut and paste of the aplay command, it works fine.  So the   
   problem looks as though it is some thing to do with the python call.   
   Both command line and python are running under the same user.   
      
   What I'm seeing logged by the python code is the following error :   
      
   ALSA lib pcm_dmix.c:999:(snd_pcm_dmix_open) unable to open slave   
   aplay: main:831 audio open error: Unknown error 524   
      
   I've tried rebooting again, and an Internet search doesn't come up with   
   anything for my particular problem (they all seem to be "nothing   
   working").   
      
   Any suggestions on what to hit with the big hammer ?   
      
   TIA   
      
   Adrian   
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