I tried Hentges Opie edition and the "normal" OZ Opie WITHOUT GPE at the same time.
Results: Kopi alarm worked with the normal OZ Opie-edition and sound sometimes (sound stops accidentally during working with the zaurus - no idea why).
I didn't find a way to get the sound working under Hentges Opie.
Maybe I'm doing something wrong - I don't know. But it seems a bit strange to me: A system with so many "bells and whistels" and on the other hand a basic feature for a PDA - the alarm feature - is not reliable working...
(yes, I know - the zaurus is much much more than only a PDA, but I use it also as a PDA...)
Correct me if I'm wrong.