Hi Terry,

> It would make sense because the speakers sometimes click part way
> through the boot sequence.

I think that's normal, more below.

> > Are you aware of
> > https://learn.adafruit.com/usb-audio-cards-with-a-raspberry-pi/instructions
> > ?
>
> I don't think it is because the Bonnet interfaces to the Pi via I2C
> not USB.

No, you're right.
https://learn.adafruit.com/adafruit-speaker-bonnet-for-raspberry-pi/raspberry-pi-usage
is applicable.  It talks about the popping.  There's a shell script you
can run, or go through the steps yourself.  I'd do the latter, just to
see if everything is currently as they expect.  Also, the shell script
should be fairly understandable as an accompaniement.

> pi@minster-music:~/Music/Playlist1 $ aplay -L
> null
>     Discard all samples (playback) or generate zero samples (capture)
> speakerbonnet

speakerbonnet is mentioned in the /etc/asound.conf the above shell
script installs so perhaps you've already followed those instructions?

-- 
Cheers, Ralph.

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