Kateikyoushi Hitman Reborn DS Flame Rumble X annoying sound

There's this annoying sound throughout the game. I can't describe it, but I'm sure some of you have heard the same sound before. I hear it when the game loads, during the cutscenes, menu, and in battle(I also lag during battles). Is there soemthing wrong with the ROM, or does it have something to do with my settings?

What are you using to play the game (emulator, flashcart) ?

No$GBA v2.6

Try using 2.6a. If that doesn't fix it, use no$zoomer as well. Links can be found in the Common Issues.