Chiptune forum

i've been using carillon editor on a gba sp for years, and i don't use samples, but it plays ok all the default waveforms.

it might be different if you are using it through the gba thingie, of course.
i mean i use it on gb/gbc flashcarts, but if you use it from a gba flashcart (say, using goomba) your mileage may vary.

hope goomba is the only problem. i haven't tried other than the default waveforms anyway.
good luck!
ps: sorry, i just saw your mail. at least i had already replied you here.