Addendum:

>>> does Trevor say that Mark Olsen is the author of a
>>> sound driver for A-Eon? Which one would that be?

>> These same issue with being able to supply complete X5000 systems
>> with new graphics cards has reached the sound cards as well.
>> So [...], drivers for newer model sound cards are required.

> Would be interesting to know which audio controller/codec
> this driver is for, and if MorphOS will get this driver as well.

Going by the Enhancer 2.0 press release, it's probably "OxygenHD AHI sound driver v4.1", which seems to be for the CMI8788 PCI audio chipset.

And regarding thread topic: "A1222 AHI sound driver v6.3" is also contained.