Really? Does your ds turn off? That's almost impossible given that can only be done by the other processor afaik.
I've tried it today and it didnt turn off. IDK what happened yesterday, maybe my battery dried.
Also, what does The X button do? If I press it, the sound kinda repeats for a second and nothing happens.
Last but not least, I've tried a homebrew called "Kawajuke" (Kawa's Jukebox) But the emulator simply gets stuck on the GameBoy Advance screen (as when the GBA has no cartridge). Is this an emulator error or a rom issue? It runs fine on VisualBoyAdvance.