AudioInjector Forums

Hi there,

If you can use the Zero board, then you can connect through a pot. on the IO board. Otherwise, you need to use software.

Matt

Hi there,

On the zero version of this sound card, you can use an IO board to pass the headphone out through a pot to the connectors.

Otherwise you have to use software - such as alsamixer.

Matt

Hi Tom,

This type of potentiometer looks right :
https://www.ebay.com.au/i/323092650590


Matt

Hi there,

If you want to change the operation of the codec, probably the best place to alter register settings is in the codec driver :
https://github.com/raspberrypi/linux/bl ... s/wm8731.c

Matt

That would be awesome - unfortunately I don't have any 3D cad files.

Matt

Is jackd running with real time priority ? Is it bumped up to the maximum ?

Matt

Hi there, It is possible that the buffer being used is too small. It is likely that with USB there is some buffering provided for you. While ffmpeg is executing can you probe the buffer size it is using ? For example : cat /proc/asound/card0/pcm0p/sub0/hw_params Here is documentation on how to probe...

Did you setup the card using the setup scripts ? Or did you manually set it up ?

when you type dmesg, can you see that the audio injector card is set up correctly ?

Matt

Thanks for the awesome picture ! Yes- you should make sure you have a secure connection between the Pi and the Zero sound card. One way is to use the PCB Quick Connect clip - as you mentioned. Another is to purchase hammer headers. Finally you can solder. If you followed the setup link you sent in y...

Yes it is possible. If you lower the sample rate to 16 kHz for example then you should have less computational load and may be able to get your latency down to 1 or 2 ms. If you want to try as low as 8 kHz, you can modify the driver to let you sample with this low sample rate. There is a thread on t...