[AudioI] Total newbie with Pi and audioinjector stereo soundcard

[Matt]

Hi TBJ,

Sounds like a great project.

Are you ok with trying command line approaches ? It may be the easiest. 
If not, we can probably work out a way to use audacity.

I think it is likely that what you are missing is the correct alsa mixer 
settings to enable the sound card's microphon. Now there are two ways 
for this sound card to capture, either line in or microphone. We will 
want to setup the microphone as input.

So that you can monitor in real time, why not connect your headphones or 
output RCAs to preamp and start sucking in audio and spitting it out to 
the speakers using this command in a terminal window :

arecord -f S32_LE -r 48000 -c 2 | aplay -f S32_LE -r 48000 -c 2 -

As your mixer isn't setup correctly, you should hear nothing ... now be 
careful about hurting your ears - don't wear the headphones on your ears !

now open alsamixer by typing it into the command line in a different 
terminal window :

alsamixer

What you want to do is toggle the alsamixer settings to get the 
microphone channeling through the ADC."

In alsamixer if you press the "TAB" button it cycles from Playback to 
Capture to All.

In Playback, got to (press the left and right arros keys till you get 
to)  "Output Mixer HiFi" and press "m" to change the "MM" to "00". This 
will enable the clocks for the digital audio subsystem.

Next in Playback, enable the microphone, press left and right until you 
get "Input Mix", press the up and down arrow keys until it says "Mic".

Now press TAB and it will take you to Capture. Highlight "Mic" by going 
left and right, then press the space bare to enable the microphone capture.

You should now hear the microphone captured audio streaming out the 
headphones. You can adjust levels by going to "Mic Boost" and "Capture" 
and use the up and down arrows to turn the levels up and down.

Matt

On 25/11/20 12:31 pm, TBJ1118 via People wrote:
> Hi everyone,
>
> I am a neuroscience researcher and a total newbie with Pi.
> I am trying to build a stand-alone birdsong recognition platform that 
> employs a github script I found, similarly to what Shazam does with 
> songs. I purchased the audioinjector stereo soundcard for my raspberry 
> pi3, I installed it and followed the great tutorial on github. 
> However, while I hear sound from headphones connected through the 
> jack, I haven't been able to test the microphone. I've tried with 
> "arecord" following various youtube tutorials as well, but I haven't 
> had any luck. I see clicking on the speaker icon in the desktop, top 
> right, that audioinjector-pi-soundcard is both setup as audio outputs 
> and audio inputs, so apparently it is installed. I have clicked (in 
> Input Device Options) to enable Mic (capture) as I thought that would 
> have allowed me to record through the built-in microphone, but it is 
> not enough to actually allow me to record.
> Any help would be much appreciated.
>
> Thanks!
>
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