Can you report on anything you see when probing for available devices ? aplay -l If nothing is there, do you see anything in the system log : dmesg Matt On 7/5/22 08:29, Marc Lavallée via People wrote:Hi, I acquired an Octo a few months ago, but never tried it. Sadly, it doesn't seem to work, and it looks like a harware issue. I don't use a stock RPI OS, I use DietPi. But it's similar, so I added 'dtoverlay=audioinjector-addons' at the end of /boot/config.txt No luck... If I understand correctly how dtoverlay works, it would looks for the octo in the /proc/device-tree folder, so there should be some trace of "audioinjector" in it... Is there something I'm missing? Marc