[AudioI] AUDIO INJECTOR STEREO SOUND CARD works on RASPBERRY pi 4b with Raspbian buster ?

[Ron]

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 <http://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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