Struggling with building kit v2 with Audioinjector Stereo [SOLVED]


Hello Fernando,

First of all thank you for great synth - I had received the the kit in 10 days at Russia/Moscow and assembled everything 2 days ago. My choice was Audioinjector stereo card and it didn’t work when I have selected it via webconfig. I suspect that it is the wiring problem, so I have to relay the GPIO pins manually (have read the forum regarding similar configs)

Never the less, I had a chance to play with Zinthian for two days with external usb card - worked fine (with reasonable latency and some rare dropouts on Pianoteq) but from tonight it gives me an error on the white screen.

Amazing - I am completely surprised with the quality of some sounds, MOD-UI and everything - crazy cool !
I was dreaming of playing with Pianoteq with small setup on live sets before for more than 10 years, now dream comes true, thanks to you guys !!!

Back to my quest: with Audioinjector everything starts, encoders work, screen works but now sound.

Please advice me a course of action or redirect to the person on the forum to ask all my questions.

My config:
Rpi 3 model B 2015
Zynthian basic kit v.2
ozzmaker piscreen 2
audioinjector stereo card

Hope I am not violating forum rules by writing you directly.

Thanks a lot !

Andrei Demidenko


Hi Andrei!

I think it would be better to open this thread to the community.
Audioinjector Stereo is a tricky beast, sometimes hard to tame. I will try to help you as much as i can, but other members could contribute with useful tips too.

BTW, have you tried to adjust the levels using “alsamixer” from command line?

Kind Regards!



This is done by the webconf when you select Audioinjector.
but using the Alsa sliders would be my first try as well.


Webconfig was the first thing I tried and it helped me with the boot screen error and let me in to the main screen. But even with chosen audioinjector alsa doesn’t see it and there is still no sound. Usb audio also doesn’t work any more. Should I try with fresh image ? But I didn’t mess with configs much. !

My setup with temporal 3d printed box.


Next step for me is to try if my audioinjector stereo works at all in separate setup (just with Raspbian distro or similar). And if it doesn’t! i will see from there further (maybe discuss hardware issues with the vendor). Hope I will make zynth work soon this way or another !

Thank you @jofemodo & @mheidt for your support !!!


Fresh image with all the updates and the instructions from here helped (both, drivers and alsactl commands).

Audioinjector works nicely now. Will submit to successful cases, when the project will be complete.


Was ist necessary to install the .deb?
Did you test it without installing it?
If the new fresh and updated image didn’t work we have to integrate the script.
My Audioinjector Zero works without the script.


I have got an upgrade (New rpi3 B+ 2017 and Samsung EVO 32Gb MicroSD) to check the installation once again. It didn’t work out of the box for me after selecting Audioinjector (mine is stereo model) in webconfig.

Alsactl commands didn’t make any difference till I installed deb package with the scripts. Then commands work and everything starts working too. Didn’t have time to check the input yet. Will do :slight_smile:


It could be a B+ issue. My installation is 3B


I’ve started zynthian with Rpi3B 2015, and same simptoms, so it is probably not just B+.


Anyway, I really hope my case will help the others with same configuration to get everything to work in no time. @mheidt, thank you very much for your support and input !

Right now I am in testing state and already have discovered some things to ask in forum.