It's hard to imagine a game using 500 sound files unless you want 60 variations of an elf sneezing! However, for a music sequencer you might want this many instrument samples, but you'd usually pre-fetch them just before they're needed. Personally, I wouldn't use AppGameKit to create anything but a toy sequencer.
OpenAL restricts simultaneous sounds playing to 32.
With luck, Erik will release an update for the latest AGK. We've been waiting patiently for a stable version. I've been also waiting with the project manager because I suspect templates may change quite a lot as the system gets updated, and we don't want the C++ chaos that we've observed!
-- Jim DO IT FASTER, EASIER AND BETTER WITH AppGameKit FOR PASCAL