I searched under ArcaOS 5.0.5 DVD, I found aswitch files I copied under MMOS2 and run aswitch.
Plugged an usb dac to it but didn't work and since then, no more audio under ArcaOS !
"removed the dac, no speaker audio, removed aswitch files, no speaker audio...."
How to reverse and get audio back using auniaud drivers ?