I got the card.
Nice design, good drivers package.
In case if you experience some output sound overload - you can solve it when you run a mixer application and reduce output levels a tiny bit.
In my case, as with the original fullsize prelude replica, I have only one zorro2 slot where the card doesn't bring dma issues and doesn't lead to ramlib errors.
Probably that is because my A4000d has Buster chip rev9, not 11.
The way of switching the aux1 mixer to MpegIt output is nice and works perfectly.
I simply connected the card output to Amiga's internal motherboard CD input. No need of lots of wires any more! All the output of native Paula, MpegIt, and AHI prelude output are mixed now inside the default Amiga hardware mixer. Thus, no need to start any applications just to hear the sound.
Nice job!