I am using the Zero audio Injector (from audioinjector.net)
It works very well, except…
The Zero Audio Injector HAT does not respond to MODEP until a few seconds after Patchbox OS reaches the console. I believe this is because the ALSA mixer doest apply its settings until then.
In the recent past, I tested using some USB sound cards. and they were available to MODEP 15 seconds in to boot (before boot finished) and MODEP was producing effects through it.
Because I am running headless. I don’t care when its done booting, but I do care when it starts processing audio. The USB card did it quicker than the Zero Audio Injector HAT. I want to see if there is a way to get the HAT audio to start before the console.