Can this be done?
In bookworm, chromium browser only sends audio to a hardware device; previously it would send it to sysdefault which allowed my own asoundrc to be processed.
If the output from chromium can be sent to the Digi then alsaloop can pick up the input and send it to sysdefault. At present it does not seem to work.
The audio from chromium will work if I assign the audio for the pi to either of the two amplifiers that are connected via USB. It also works via sndrpihifiberry and optical output from the pi to the amplifier.