Sound installation

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Sound

Headphone jack

On bullseye (Raspbian GNU/Linux 11 (bullseye)) the default is sound on the HDMI.

To see the Linux version use

cat /etc/os-release

Change output to the headphone jack a configuration file is needed

Create a file called .asoundrc

nano ~/.asoundrc

insert these two lines (1=jack, 0=HDMI sound):

defaults.pcm.card 1
defaults.ctl.card 1

Logout and re-login.

On the GUI interface, there are other options, but not from software or the command line.

Festival

Easily understandable voice, but takes time to generate and require two intermediate files

sudo apt install festival
echo "The brown fox jumps over lazy dog" > aaa.txt
text2wave aaa.txt -o aaa.wav
aplay aaa.wav

or on one line

echo "The brown fox jumps over lazy cat" | text2wave -o ccc.wav && aplay ccc.wav

Music files

Play sound files, like

sudo apt-get install sox libsox-fmt-all
play -v0.1 music.mp3

This line plays an mp3 file with volume reduced by a factor 0.1. The at startup the blue button on the gamepad plays the file in /home/local/Music/music.mp3.
This is a symbolic link to some real music (Radetzky Marsch in this case):

ls ~/Music
   radetzky-marsch_Schloss-Schoenbrunn-Konzerte_Wien_full-length.mp3
cd ~/Music
ln -s radetzky-marsch_Schloss-Schoenbrunn-Konzerte_Wien_full-length.mp3 music.mp3

The free music is found at

https://www.imagevienna.com/en/services/downloadarea/downloads.html

https://www.imagevienna.com/fileadmin/mp3/radetzky-marsch_Schloss-Schoenbrunn-Konzerte_Wien_full-length.mp3

and can be downloaded using a wget command and then make a link named music.mp3:

cd Music
wget https://www.imagevienna.com/fileadmin/mp3/radetzky-marsch_Schloss-Schoenbrunn-Konzerte_Wien_full-length.mp3
ln -s radetzky-marsch_Schloss-Schoenbrunn-Konzerte_Wien_full-length.mp3 music-mp3

Sound level

On a Raspberry pi version 3+ (not tested on other versions)

$ amixer
 Simple mixer control 'PCM',0
   Capabilities: pvolume pvolume-joined pswitch pswitch-joined
   Playback channels: Mono
   Limits: Playback -10239 - 400
   Mono: Playback 400 [100%] [4.00dB] [on]

The name 'PCM' may be different, e.g. 'Headphone' or otherwise

An thus:
Setting the sound level can be done by:

amixer set PCM 0dB unmute

Setting to maximum (100%) is about the same as setting 4dB (may be too much for amplifier).

amixer set PCM 100% unmute