I'm beginning to think that upgrading the music and bells Pis to bullseye 
might have been a bit premature.  I cannot get amixer to work properly. The 
sound card is an Adafruit Speaker Bonnet. The code shown below worked under 

Here is the configuration:

pi@minster-bells:~ $ amixer
Simple mixer control 'PCM',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 255
Front Left: 255 [100%]
Front Right: 255 [100%]

I need the volume to be controllable from my Python program, so I set it once 
at the beginning when the program is launched, eg:

amixer -c 0 set PCM 100

(where the value is a variable in reality, but this doesn't work either.)

I get:

amixer: Invalid command!

Any thoughts on what could be wrong? speaker-test and playing an mp3 file works 
fine using mpg123. I just can't set the volume.


                Terry Coles

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