Hello Esteban,

Try this first before re-installing the O.S.   sudo apt install alsa-utils   .   You may need to do a:   sudo apt update and then sudo apt full-upgrade before installing the alsa utils.

After this is completed at a command line, try:   aplay -l.  This will list all the attached audio devices.   If it shows audio devices then try:  alsamixer.  

If none of this works,  I think you will need to download the current Raspbian O.S from the Raspberry site: https://www.raspberrypi.org/downloads/raspberry-pi-os/

Make sure you select "Raspberry Pi OS (32-bit) with desktop and recommended software". Do not select either of the other options.  You want the full package.

73,
Ron / W4MMP
On 9/1/2020 12:14, Esteban Mocetti wrote:
Apparently they are not installed or not in the same place, I installed Raspbian buster via raspbian imager, days before they change the name of Raspbian Buster to official raspberry pi OS (in july 2020, i dont remember the exact day). I did update and upgrade later. But in the desktop menu ALSA mixer is not there... like it was on RPI3B+, and when I try some ALSAmixer commands from terminal... it returns the message....command not found. Do I need to install again Raspberry pi OS from raspbian imager again (previously formating and erasing all from the sd card), or installing ALSA utils package manually could solve my problem?.
Thank you very much for your answer!
Esteban

El mar., 1 sept. 2020 12:19, Ron via People <people@lists.audioinjector.net> escribió:

Hello Esteban,

I'm not sure why you say the ALSA mixer commands are not available.  I just performed a complete installation of Buster (A.K.A Raspbian O.S.) on a RPi 4B.   Alsamixer is available along with the other ALSA utilities.  I use it control the Audio Injector Zero. 

73,
Ron / W4MMP
On 8/31/2020 16:44, Esteban Mocetti via People wrote:
Since ALSA mixer commands are not accessible from Linux Raspbian Buster in RPi4b, I saw that they are replaced by  PulseAudio, a network-capable sound server program distributed via the freedesktop.org project.
In broad terms I understand ALSA is a kernel subsystem that provides the sound hardware driver, and PulseAudio is the interface engine between Applications and ALSA. In a typical installation scenario under Linux, the user configures ALSA to use a virtual device provided by PulseAudio. Thus, applications using ALSA will output sound to PulseAudio, which then uses ALSA itself to access the real sound card. PulseAudio also provides its own native interface to applications that want to support PulseAudio directly, as well as a legacy interface for ESD applications, making it suitable as a drop-in replacement for ESD. I cannot find ALSA mixer commands in raspbian buster, that is because they are not there, so the sound uses pulseaudio directly ? or ALSA is running behind pulse audio? 

So, in this context.... Audio Injector Stereo Sound Card... with Raspbian buster on RPi4b.. will still work with pulseaudio directly or only with ALSA mixer behind?, I need to reinstall ALSA mixer to recognize and access the sound card parameters?, or I can access and control sound card with ALSA behind pulse audio in some form?. Is it possible to manage sound cards via pulseaudio directly?. Has anyone tested this issue? Do I need to go back to RPI3b+ and Raspbian Jesse to use ALSA mixer with this sound card? 
A lot of questions.. excuse me....
Please, if anyone could help me..., it will be really important for a music project with my son at school now, so it will affect the decision to buy 5 to 10 sound stereo cards from audio injector. I am from Argentina,  sorry for my english since it is not my native language.
Thank you very much in advance to everyone.
Esteban.


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