[AudioI] Issues with Audio Injector Stereo and various versions of Raspberry Pi

[Terry O'Connor]

Thanks Matt

IN have been persisting with this and have found what you have described  below.  I have removed the Pulse Audio package and things seem to work a little better


Terry

> On 26 Feb 2021, at 11:43 am, Matt <matt at audioinjector.net> wrote:
> 
> I'm having a go at this. I can see that RaspbianOS has a new default alsa setup - they do tend to get very creative with audio in a non-robust fashion! When I look at alsamixer, I can see that they have setup an arbitrary sound card as the default - that will not work for us.
> 
> I start alsamixer from the command line, select the audio injector card by pressing "F6" and using the arrow keys.
> 
> I then enable the "Output Mixer HiFi" setting.
> 
> I then play and can hear the audio through the headphones.
> 
> Does this help you at all ?
> 
> 
> Another way to do this is to use amixer like so :
> 
> amixer -Dhw:0 sset 'Output Mixer HiFi' on
> 
> 
> Here is how I replicated this problem I saw ...
> 
> I have a Pi 4, with the latest "Raspberry Pi OS with desktop" v5.4, Jan 11th 2021.
> 
> Wrote to an sdcard. created an empty file /boot/ssh.
> 
> Copy my key to the pi : ssh-copy-id pi at raspberrypi.local
> ssh to the pi : ssh pi at raspberrypi.local
> 
> Following the manual setup method from here :
> 
> https://github.com/Audio-Injector/stereo-and-zero
> 
> I didn't run rpi-update as it is a recent os.
> 
> Rebooted.
> 
> Installed sox :
> 
> sudo apt install libsox-fmt-all sox
> 
> Got an audio file and converted it to wav :
> 
> wget https://ogg.jamendo.com/download/track/206407/ogg1/ -O audio.ogg
> 
> sox audio.ogg audio.wav
> 
> alsamixer # chose the non default soundcard and enabled the "output mixer hifi" control.
> 
> aplay audio.wav
> 
> now it works !
> 
> On 26/2/21 10:31 am, Terry O'Connor via People wrote:
>> Hi guys
>> 
>> I am have some serious issues with 3 stereo sound cards.  Now all 3 cards work when connected to a Raspberry Pi model 2B, no problems.
>> 
>> However, when i attempt to use the same cards on a Raspberry 3B+ or a Raspberry Pi 4 or Pi 400 only one of the cards work. One of the cards is not event recognised when I issue the play -l command.  The second card is recognised and I can get audio to passthrough from input to output but audacity does not see any audio input when I have selected the stereo card as the input device.
>> 
>> There is obviously something different between the Pi2 and the Pi 3B+ and Pi4 as it is only the hardware that is different.
>> 
>> Any ideas as to why I am seeing the behaviour.  It is important that I get some resolution on this as I am with a group that is looking at using these cards with the Pi4 for a community radio OB unit project.
>> 
>> 
>> Regards
>> 
>> 
>> Terry O'Connor
>> 
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